Ecommerce Glossary — Key Terms & Definitions for Online Store Platforms

A–B C–D E–F G–H I–K L–N O–P R–S T–Z

A B C D E F G H I J K L M N O P R S T U V W

A – B

Abandoned Cart Metric: A shopping cart that was created but never completed into a purchase. The abandoned cart rate is calculated as: (abandoned carts / total carts created) × 100. Average abandoned cart rates are 60-80% for ecommerce. Recovery strategies include email follow-ups, exit-intent popups, and cart recovery SMS.
ACH (Automated Clearing House) Payments: A US electronic payment network for bank-to-bank transfers. ACH payments have lower processing fees than credit cards (typically 0.5-1% vs 2.5-3%) but take 2-5 business days to clear. Popular for B2B ecommerce, subscription billing, and high-value B2C orders where the fee savings justify the wait.
AOV (Average Order Value) Metric: The average dollar amount spent per order. Calculated as: Total Revenue / Number of Orders. Raising AOV is a primary growth lever — if your AOV is $50 and you can increase it to $60 with the same traffic, you grow revenue 20% without more marketing spend. Strategies: bundles, upsells, free shipping thresholds.
API (Application Programming Interface) Platform: A set of rules that allows different software systems to communicate with each other. Ecommerce platforms expose APIs that allow developers to build custom integrations: connecting inventory management, syncing with ERPs, automating marketing workflows, and creating headless storefronts. API quality and documentation vary significantly between platforms.
ARPPU (Average Revenue Per Paying User) Metric: The average revenue generated by each paying customer over a defined period. Unlike AOV (per order), ARPPU includes repeat purchases. Calculated as: Total Revenue / Number of Paying Customers. Critical for subscription and membership stores where customer lifetime value drives business decisions.
Bounce Rate Metric: The percentage of visitors who leave your store after viewing only one page, without taking any action. High bounce rates on product pages suggest quality or relevance issues; on the homepage, they may indicate poor navigation or slow load times. Average ecommerce bounce rate: 30-55% depending on traffic source and device.
Bundling Marketing: Selling multiple products together as a package at a discounted price. Common strategies: pure bundling (must buy together), mixed bundling (choose from options), and volume discounts. Bundling increases AOV, reduces per-order shipping costs, and helps move slow-selling inventory.

C – D

CAPTCHA Platform: Challenge-Response Automated Public Turing test to tell Computers and Humans Apart. Used on store forms (login, registration, checkout, contact) to prevent bot attacks, fake accounts, and spam orders. Modern alternatives like Google reCAPTCHA v3 run invisibly in the background without user friction.
Cart Abandonment Rate Metric: The percentage of shoppers who add items to their cart but leave without completing checkout. Industry average is 65-75%. Top reasons: unexpected shipping costs, slow checkout, account creation requirement, and lack of payment method trust. Recovery typically involves email sequences, exit-intent offers, and SMS reminders.
Chargeback Payments: A dispute filed by a cardholder with their bank after a transaction, requesting a reversal of a charge. Chargebacks result in the sale amount being returned to the buyer plus a dispute fee to the merchant. High chargeback rates (>1%) can result in payment processor termination. Common causes: fraud, misrepresentation, and friendly fraud (buyer forgets they made the purchase).
Checkout Conversion Rate Metric: The percentage of shoppers who begin checkout and complete a purchase. Calculated as: (completed orders / checkout starts) × 100. Average ecommerce checkout conversion: 60-80% of cart completers. Improving checkout conversion is the highest-leverage optimization — even a 5% improvement in checkout completion can increase revenue significantly.
CMS (Content Management System) Platform: Software for creating and managing digital content. In ecommerce, the CMS handles product descriptions, blog posts, pages, and media. WooCommerce is a plugin for WordPress (a CMS). Shopify has its own CMS built in. The CMS quality affects how easily non-technical staff can manage store content.
COD (Cash on Delivery) Payments: A payment method where the customer pays in cash at the time of delivery rather than online. Common in markets with lower credit card penetration (parts of Asia, Middle East, Latin America). COD reduces cart abandonment in these markets but introduces risk (non-delivery, refused packages) and operational complexity.
Conversion Rate (CVR) Metric: The percentage of visitors who complete a purchase. Calculated as: (orders / unique visitors) × 100. Industry average: 1-4% depending on category, traffic source, and device. Fashion: 1-2%, electronics: 2-3%, luxury goods: 3-5%. Most stores leave significant conversion optimization potential untapped — a 1% to 2% CVR improvement is often achievable.
CPS (Cost Per Sale / Cost Per Acquisition) Marketing: The amount you pay to acquire one paying customer. Calculated as: Total Ad Spend / Number of Orders. If you spend $500 on ads and get 10 orders, your CPS is $50. Understanding your true CPS (including all fees and returns) is essential for profitable advertising. Marketing efforts should target a CPS well below your customer's average order value.
Cross-Sell Marketing: Recommending related or complementary products at checkout or on product pages. "Complete the look," "Frequently bought together," and "Customers also bought" are common cross-sell implementations. Cross-selling typically has higher conversion rates than upselling because the products are contextually related to what the customer already chose.
CTR (Click-Through Rate) Metric: The percentage of people who click on a link or ad after seeing it. Calculated as: (clicks / impressions) × 100. Ad CTR varies by platform and industry: Google Search ads 3-5%, Facebook/Instagram ads 0.5-2%, email 2-5%. Low CTRs on product listings suggest the product image or title needs improvement; low CTRs on ads suggest targeting or creative issues.
CSV Import Platform: A method of uploading large numbers of products to an ecommerce store via a spreadsheet file. Most platforms support CSV import for products, customers, and orders. Understanding CSV format is essential for store setup and migration — it's the universal language of ecommerce data transfer between platforms.
Dropshipping Platform: A fulfillment model where the store doesn't hold inventory — when a customer orders, the store purchases the item from a third-party supplier who ships directly to the customer. Pros: no inventory risk, low startup cost. Cons: lower margins, less control over shipping speed and quality, crowded market. Most major platforms support dropshipping either natively or through apps.

E – F

ERP Integration Platform: Connecting your ecommerce platform to an Enterprise Resource Planning system (SAP, NetSuite, Oracle) for synchronized inventory, orders, and financial data. ERP integrations prevent overselling (inventory mismatch) and reduce manual data entry. Most platforms offer native or app-based ERP integrations, though custom development may be needed for enterprise setups.
Fees (Payment Processing) Payments: Charges applied by payment processors and platforms for handling transactions. Components: interchange fee (set by card networks, ~1.5-2.5%), assessment fee (card network charge), and processor markup (their profit, ~0.1-0.5%). Most merchants pay 2.5-3.5% + $0.30 per transaction. Flat-rate processors (Stripe, Square) charge a single rate regardless of card type.
Fees (Platform / SaaS) Platform: Monthly or annual subscription fees for using a hosted ecommerce platform. Shopify tiers: $9-$2,000+/mo. BigCommerce: $29-$299+/mo. Some platforms (WooCommerce, PrestaShop) charge no platform fee — you only pay hosting and extensions. Evaluate total platform cost including transaction fees, app subscriptions, and hosting before choosing.
Fulfillment Shipping: The process of receiving an order, picking and packing the items, and shipping it to the customer. Options: in-house fulfillment (you handle everything), third-party logistics (3PL, outsourced), dropshipping (supplier ships directly), or hybrid (mix of in-house and 3PL). Fulfillment costs are typically the second-largest expense after cost of goods.
Fulfillment Rate / Perfect Order Rate Metric: The percentage of orders fulfilled without errors — correct items, correct quantities, correct address, on time, in good condition, with all documentation. Perfect Order Rate = (error-free orders / total orders) × 100. A rate below 98% indicates fulfillment process problems that will drive customer complaints and refunds.
Free Shipping Threshold Shipping: A minimum order value required to qualify for free shipping. Strategically set slightly above your average order value to encourage customers to add one more item. If your AOV is $65, setting free shipping at $75 drives incremental revenue with minimal actual shipping cost increase for lightweight products.

G – H

Gatekeeper Page Platform: A page requiring account creation or login before viewing products or pricing. Common in B2B and wholesale ecommerce. Gatekeeper pages increase lead capture but reduce organic traffic from search engines (Google can't see behind the login). Use with care — balance data capture against acquisition friction.
Headless Commerce Platform: An architecture where the frontend (what the customer sees) is decoupled from the backend (where data lives). The frontend can be built with any technology while connecting to the backend via APIs. Benefits: extreme design flexibility, ability to deliver across multiple touchpoints (web, mobile, IoT). Major platforms offering headless: BigCommerce, Shopify (Storefront API), Magento.
Hosting (Managed vs. Self) Platform: Where your store's files and database live. Managed/SaaS hosting (Shopify, BigCommerce): the platform handles all server management — you focus on the store. Self-hosted (WooCommerce, Magento): you're responsible for choosing, configuring, and maintaining your web server. Self-hosting costs $20-200/month for small stores; managed hosting is built into your platform subscription.

I – K

Interchange Fee Payments: The fee charged by the customer's card-issuing bank (not the payment processor) for handling a credit card transaction. Set by card networks (Visa, Mastercard), not by processors. Typically 1.5-2.5% per transaction. This is why business credit cards (with better rewards) often cost merchants more to accept than consumer cards — interchange rates vary by card type.
Inventory Management Platform: The process of tracking stock levels, incoming inventory, and order fulfillment to prevent overselling and stockouts. Modern ecommerce platforms integrate real-time inventory tracking. Advanced inventory management includes: reorder points, dead stock analysis, multi-location tracking, and demand forecasting. Poor inventory management is a leading cause of revenue loss and customer churn.
KPI (Key Performance Indicator) Metric: A measurable value that demonstrates how effectively a store is achieving key business objectives. Essential ecommerce KPIs: Conversion Rate, AOV, Customer Acquisition Cost (CAC), Customer Lifetime Value (CLV), Cart Abandonment Rate, and Net Promoter Score (NPS). Track the same 5-7 KPIs consistently rather than measuring everything inconsistently.

L – N

LTV (Lifetime Value) Metric: The total revenue a business can expect from a single customer over the entire relationship. Calculated as: Average Order Value × Purchase Frequency × Customer Lifespan. A store with $60 AOV, 2 purchases/year, and 3-year average customer lifespan has an LTV of $360. LTV:CAC ratio should exceed 3:1 for a sustainable business model.
Marketplace Fee Platform: Commissions charged by third-party marketplaces (Amazon, eBay, Etsy, Walmart) for listing and selling products. Amazon fees: 8-15% referral + FBA fees. Etsy: 6.5% transaction + listing + payment processing. These fees are in addition to standard payment processing fees. Always calculate your true margin after marketplace fees before pricing products.
Multi-Currency Payments: The ability to display prices and accept payments in multiple currencies. Options: dynamic currency conversion (processor handles it, customer pays in their card's currency), manual multi-currency (you set prices per country), and true multi-currency (platform processes payments in local currencies with local settlement). True multi-currency requires payment processor support and adds operational complexity.
Multi-Store (Multi-Domain) Platform: Running multiple separate storefronts from a single platform account or backend. Common use cases: different brands, different countries, different B2B/B2C channels. Shopify supports multiple stores at higher plan tiers. WooCommerce supports unlimited stores (separate installations). BigCommerce supports multiple storefronts on a single account.

O – P

OMS (Order Management System) Platform: Software that centralizes order data from multiple sales channels (online store, marketplaces, physical retail) into a single view. An OMS enables: unified customer records, inventory optimization across locations, automated fulfillment routing, and returns management. Large stores moving beyond basic platform capabilities typically invest in a dedicated OMS.
PaaS (Platform as a Service) Platform: A cloud service that provides a platform for building and running applications without managing underlying infrastructure. In ecommerce, PaaS refers to the managed server environment. Shopify and BigCommerce are PaaS in nature — they abstract away server management so merchants can focus on their store. Self-hosted WooCommerce/Magento require managing your own PaaS (AWS, Heroku, etc.).
PCI-DSS Payments: Payment Card Industry Data Security Standard. A set of security requirements that any business handling credit card data must follow. Compliance levels range from SAQ A (simplest, for merchants using hosted payment pages) to full ROC (Report on Compliance, required for large merchants). Using hosted payment processors (Stripe, PayPal) dramatically simplifies PCI compliance.
POS (Point of Sale) Platform: Hardware and software for accepting payments in physical locations. Many ecommerce platforms include or offer POS integrations: Shopify POS, BigCommerce POS. Unified commerce means inventory, customer data, and orders sync between online and offline channels. Modern POS systems accept NFC (Apple Pay, Google Pay), QR codes, and traditional card payments.
Product Feed Marketing: A structured data file (CSV, XML, JSON) containing product information for use in marketplaces, comparison engines, and advertising platforms. Product feeds include: title, description, price, images, categories, and custom attributes. Google Shopping, Facebook Catalog, and Amazon all require product feeds for listing management.
Product Listing Page (PLP) Platform: The page displaying multiple products — a category page, search results page, or collection page. PLP optimization focuses on: product image quality, title clarity, price visibility, filtering/sorting ease, and pagination strategy. In competitive categories (fashion, electronics), PLP quality is a significant conversion lever.
Product Information Management (PIM) Platform: Software for centralizing and managing product data across all channels. A PIM stores: descriptions, specifications, images, videos, translations, and channel-specific attributes. Stores with 500+ SKUs, multi-channel presence, or international operations typically need a PIM. Without a PIM, product data becomes inconsistent across channels, causing customer confusion and operational problems.

R – S

Refund Rate Metric: The percentage of orders that result in a refund. Calculated as: (refunded orders / total orders) × 100. Healthy refund rates vary by category: apparel typically 10-20%, electronics 5-10%, consumables under 2%. Rates above category norms indicate product quality issues, inaccurate descriptions, or sizing problems. Track refund reasons — they're direct customer feedback.
Repricing Marketing: Automatically adjusting product prices based on competitor prices, demand signals, or inventory levels. Repricing software is common on marketplaces (Amazon, eBay) where competitive positioning directly affects sales. Shopify and WooCommerce have repricing apps available. Repricing requires careful margin protection rules to avoid destructive price wars.
ROAS (Return on Ad Spend) Marketing: The revenue generated for every dollar spent on advertising. Calculated as: Revenue from Ads / Ad Spend. A ROAS of 5:1 means $5 revenue per $1 ad spend. What constitutes "good" ROAS depends on your margins: a store with 60% gross margins can afford lower ROAS than a store with 20% margins. Always calculate ROAS against true profit, not gross revenue.
SaaS (Software as a Service) Platform: Software delivered over the internet via subscription, where the vendor manages all infrastructure and maintenance. In ecommerce: Shopify, BigCommerce, Wix, Squarespace are SaaS platforms. You pay a subscription, log in, and run your store. Contrast with self-hosted platforms (WooCommerce, Magento) where you manage your own infrastructure. SaaS = convenience + platform risk; self-hosted = control + operational burden.
SKU (Stock Keeping Unit) Platform: A unique alphanumeric code assigned to each product variant for inventory tracking. Example: "SHIRT-RED-M-L" for a medium red shirt. Each distinct combination of size, color, and style should have its own SKU. SKUs enable accurate inventory tracking, order fulfillment, and reporting. Most platforms generate SKUs automatically, but custom SKU systems are often needed for complex catalogs.
SSL Certificate Payments: A digital certificate that encrypts data between a visitor's browser and your store's server, enabling HTTPS. Required for secure checkout and PCI-DSS compliance. On SaaS platforms, SSL is automatic and included. On self-hosted platforms, you need to install and maintain SSL (Let's Encrypt is free). Modern browsers flag non-HTTPS stores as "Not Secure," reducing customer confidence and conversion rates.
Subscription Ecommerce Platform: A business model where customers pay recurring fees (weekly, monthly, annually) to receive products or services. Types: curation boxes (Ipsy), replenishment (Dollar Shave Club), access/content (Amazon Prime). Subscription models provide predictable recurring revenue but require ongoing value delivery to prevent churn. Most major platforms have subscription billing apps or native features.

T – Z

Tax Automation Platform: Software that calculates and remits sales tax automatically based on customer location. In the US, post-Wayfair, online sellers must collect tax in all states where they have economic nexus. Tax automation tools (TaxJar, Avalara, Vertex) integrate with most platforms and handle rate calculation, filing, and remittance. Most stores need tax automation once they exceed ~$100K in annual sales or sell in multiple states.
Third-Party Logistics (3PL) Shipping: Outsourcing your warehousing, packing, and shipping operations to an external fulfillment company. 3PL providers (ShipBob, ShipMonk, Deliverr/Amazon) store your inventory, pick and pack orders, and ship to customers. Benefits: scalability, reduced fulfillment burden, often cheaper shipping rates through volume. Trade-offs: less control over packaging and delivery experience, integration complexity, per-order fees.
UPS / FedEx / USPS Integration Shipping: Direct integration between your ecommerce platform and shipping carriers for real-time rate comparison, label printing, and tracking updates. Most platforms include carrier integrations natively. Advanced features: calculated shipping rates at checkout, multi-carrier rate shopping (showing customers options from multiple carriers), and automated tracking emails.
Upsell Marketing: Encouraging a customer to purchase a higher-tier or premium version of the product they're buying. "Upgrade to Pro version for $10 more," "Premium support add-on." Upsells have higher margins than the base product because you're selling to an already-converted customer with reduced acquisition cost. Implement upsells on product pages, in cart, and at checkout.
Variant (Product Variant) Platform: Different versions of the same product — sizes, colors, materials, or other options. Each variant may have different inventory levels, prices, images, and SKUs. A shirt with 3 colors × 5 sizes = 15 variants. Platform variant management quality matters significantly for stores with complex product options.
VAT (Value Added Tax) Payments: A consumption tax added to products at each stage of production based on the value added. Required in most countries outside the US. Ecommerce stores selling internationally must understand: VAT registration thresholds (vary by country), how VAT affects pricing display, and One-Stop Shop (OSS) schemes for simplified EU VAT reporting. VAT compliance is a significant burden for stores selling into Europe.
Webhooks Platform: Automated notifications sent from one system to another when specific events occur. Ecommerce platform webhooks trigger when: an order is placed, a payment succeeds, a product is updated, or a customer signs up. Webhooks enable real-time integrations with ERPs, accounting software, marketing automation, and custom applications. API defines the data format; webhooks deliver it automatically.
YoY Growth (Year-over-Year) Metric: A comparison of a metric (revenue, orders, traffic) to the same period in the previous year. YoY Growth = ((Current Period - Prior Year Period) / Prior Year Period) × 100. YoY removes seasonal effects that month-over-month comparisons can't — December vs. November is always misleading; December vs. last December gives a true growth picture.

Disclaimer: This glossary provides general educational definitions of ecommerce terminology. We are not affiliated with any platform vendor or payment processor. Term usage may vary between platforms and regions.