An API is a set of specified rules that describe how computers and applications interact. APIs lie between an application and a web server, acting as a data transfer mediator.

An API works as follows:

  • To retrieve information, a client application makes an API call, which is also known as a request. This request, which contains a request verb, headers, and sometimes a request body, is sent from an application to a web server via the API’s Uniform Resource Identifier (URI).
  • The API makes a call to the external programme or web server when it receives a valid request.
  • The server responds to the API with the information requested.
  • The data is transferred to the original requesting application via the API.
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