What does REST API mean?

A REST API is an interface that allows different applications and systems to communicate with each other via web requests. REST is based on an architectural style that works with resources accessible via URLs and uses standard HTTP methods, such as GET to retrieve data, POST to create, PUT or PATCH to update and DELETE to remove. Data is often exchanged in JSON format. In e-commerce, a REST API is used to connect an e-shop with a payment gateway, warehouse, CRM, carrier or other services. The advantage is standardized and flexible communication between systems without the need to tightly couple them technically.