People often use the word 'API' when what they are really talking about is a single API endpoint. APIs, sometimes called services or API products, are collections of endpoints that serve a business function. An endpoint, on the other hand, is a resource (or resource path, also known as URI - uniform resource identifier) and the operation performed on it (create, read, update or delete - operations which in RESTful APIs are typically mapped to the HTTP methods POST, GET, PUT, and DELETE).