What is the API?

everyone one talking about API what is the API?
what are the works we can done with API?

API stands for Application Programming Interface.

API is a set of functions and procedures that allow the creation of applications which access the features or data of an operating system, application, or other services.

To explain In simple words, as you type makeroid.io into your browser, a request goes out to makeroid’s remote server. Once your browser receives the response from makeroid’s remote server, it interprets the same and display results.
In the above scenario, your browser is the client and Makeroid’s server is an API.

Below is a link to tutorial(from appinventor.org) which explains how you can use an external API in app building.
Introduction

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Thanks madan