What Is an Ecommerce Glossary?

An ecommerce glossary is a reference library of terms used across online retail – covering advertising metrics, technical integrations, operational systems, marketplace concepts, and feed management terminology. This glossary is designed for online merchants, ecommerce managers, and digital marketing teams who work with platforms like Shopify, WooCommerce, Amazon, bol.com, and Google Shopping.

Every term in this glossary includes: a clear definition, an AI-optimised summary for quick reference, a concrete ecommerce example, common mistakes to avoid, best practices, and links to related articles and guides.

To sell on OnBuy, you register as a seller, list your products in the format OnBuy requires, and keep your stock and orders in sync. The quickest way to do all three is to connect your existing store to OnBuy with Koongo, which automates the data work so you can list in an afternoon rather than a month.

But before the how, the why. OnBuy has a few things going for it that set it apart from the marketplaces most sellers start with. Here’s what OnBuy is, why sellers are moving to it, the one real challenge in getting listed, and exactly how Koongo handles that challenge.

This offer is an early-bird deal: pay for one month of your seller subscription by 31 July 2026, and your next 12 months of subscription are free, so you get 13 months of selling for the price of one. Because OnBuy, easyShop, and Comet all run on the same OnCommerce account, that single subscription covers all three marketplaces as they launch. Standard selling fees on your actual sales still apply, so it’s the subscription cost that’s waived, not selling on the platform entirely.

Amazon is the world’s largest online marketplace, with over 300 million active customer accounts globally and annual third-party seller revenue exceeding $140 billion. For European merchants, selling on Amazon is not just a growth option – it is increasingly a baseline expectation in competitive product categories.

The good news: the barriers to entry are lower than most sellers expect. You do not need a US legal entity, a US bank account, or a dedicated development team to get started. What you do need is a clear understanding of how Amazon’s seller infrastructure works, what product data requirements you must meet, and how to keep your inventory and orders in sync across channels once you are live.

This guide covers everything a European merchant needs to know before listing their first product on Amazon – from account setup and VAT obligations through to product attributes, common errors, and multi-channel order management.

Pricing and features verified as of June 2026, based on koongo.com/pricing, datafeedwatch.com/pricing, and independent user reviews on G2, Capterra, and Tekpon.

If you are comparing product feed tools, the decision usually comes down to one core distinction: feed management vs marketplace management. Feed management tools optimise and distribute your product data to advertising and comparison channels like Google Shopping or Meta Ads. Marketplace management goes further – it connects your store directly to marketplaces like Amazon, bol.com, or Zalando, syncing not just product listings but also inventory and orders.

This comparison is for merchants evaluating Koongo Pricing against DataFeedWatch as a DataFeedWatch alternative – particularly those selling on multiple marketplaces and channels from Shopify, WooCommerce, or Magento. DataFeedWatch is built primarily for feed management. Koongo combines feed management and marketplace integration software in one platform, which matters most if your roadmap includes direct marketplace selling rather than advertising feeds alone.

Below, we compare pricing, features, marketplace coverage, ease of use, and real costs for a sample store, so you can see which platform fits your specific situation.

A new marketplace, easyShop, is launching for peak season 2026, and if you already sell on OnBuy you’re closer to being on it than you might think. The reason is OnCommerce: the platform that connects OnBuy, easyShop, and the returning Comet brand, letting sellers reach all three through a single account and a single product catalogue.

But what exactly is OnCommerce, how does the one-account model work, and what does each marketplace offer a seller? This guide breaks it down in plain terms: what OnCommerce is, the three marketplaces it powers, how listings, stock, and payments stay in sync across them, and the early-bird offer that gives you 12 months of subscription free if you join by 31 July 2026. We also cover how to connect your store to all three with Koongo, with no coding required.