Headless eCommerce is an e-commerce architecture where the front-end (head) is decoupled from the back-end commerce functionality and can thus be updated or edited without interfering with the back-end, similar to a headless content management system (CMS).

Headless eCommerce is built on a more modular approach where the front-end and back-end are separated from each other. This allows for greater flexibility and scalability as it enables businesses to use different tools and technologies for the front-end and back-end.