API is a mechanism for sending and receiving data to and from the server. For example, when you are opening a website, you are actually sending a request to the server to receive a web page, where the request is sent using an API; the browser does it for you.

Any type of communication you see on the website or mobile application is done with an API. For example, when you click on the update score button to get the latest cricket score, it is received using an API.

Till now, I have developed and modified lots of APIs.