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In computer programming  an application programming interface (API) is a set of subroutine definitions, protocols, and tools for building application software In general terms, it is a set of clearly defined methods of communication between various software components. A good API makes it easier to develop a ccomputer program by providing all the building blocks, which are then put together by the programmer An API may be for a web-based system, operating system,database system, computer hardware systewm or software library  An API specification can take many forms, but often includes specifications for routines, data structures, object classes variables or remote calls. POSIX, Microsoft windows API  the C++,Standard Template Library,and java APS are examples of different forms of APIs. Documentation for the API is usually provided to facilitate usage.

 

 

  

 

 

Popular API Examples

ProgrammableWeb, a site that tracks more than 15,500 APIs, lists Google Maps, Twitter, YouTube, Flickr and Amazon Product Advertising as some of the the most popular APIs. The following list contains several examples of popular APIs:

1. Google Maps API: Google Maps APIs lets developers embed Google Maps on webpages using a JavaScript or Flash interface. The Google Maps API is designed to work on mobile devices and desktop browsers.

2. YouTube APIs: YouTube API: Google's APIs lets developers integrate YouTube videos and functionality into websites or applications. YouTube APIs include the YouTube Analytics API, YouTube Data API, YouTube Live Streaming API, YouTube Player APIs and others.

3. Flickr API: The Flickr API is used by developers to access the Flick photo sharing community data. The Flickr API consists of a set of callable methods, and some API endpoints.

4. Twitter APIs: Twitter offers two APIs. The REST API allows developers to access core Twitter data and the Search API provides methods for developers to interact with Twitter Search and trends data.


5. Amazon Product Advertising API: Amazon's Product Advertising API gives developers access to Amazon's product selection and discovery functionality to advertise Amazon products to monetize a website.

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