API(Application programming interface) is the set of routines or protocols which allow user to accessing web based software applications and web tools. Companies release their API into market that work like building block for the developers to develop web software easily and faster. For example when user copy link or url of one website and post it on facebook it’s API that work behind to show post of another website on user facebook. API’s are work software to software not to the users it’s not direct view by users but it’s use by developers.

1. APPLICATION PROGRAMMING INTERFACE
API(Application programming interface) is the set of routines or protocols
which allow user to accessing web based software applications and web
tools. Companies release their API into market that work like building
block for the developers to develop web software easily and faster.There
are so many API’s available over the internet for the development of
websites and applications. Some of them are most popular like Google,
Yahoo, Facebook, Flickr and many more.

2. Following are some most used and popular API’s all over
the world.
●
Google API
Google having so many API’s at present, it become more than just
search engine and increase their user base. It’s not only for searching
social networking site, emails, or maps. Google API are design and
develop for easy use and standard work which can be used by any
developer.
https://developers.google.com/apis­explorer/#p/

3. ●
Facebook API
Facebook is biggest social networking site having large user base.
Facebook provide API’s for chat, share pages, like pages or site, login
system by using facebook id’s user can sign in for other website and
many more.
https://developers.facebook.com/
●
Twitter API
Twitter is famous for latest information in world just by writing short
message. This social networking site having all information like
business, sports, politics and many more. This provide many API’s like
facebook for example like, share, login and other.
https://dev.twitter.com/overview/documentation

4. ●
Youtube API
Youtube is biggest video service by Google. As Google having so many
API’s youtube is one of them. But youtube having some features in their
API like Youtube data API, Youtube playing API, integrated video
content and many more.
https://developers.google.com/youtube/v3/
●
Flickr API
Flickr is popular photo sharing site where people can upload photos
and user give rating to that. Flickr provide API like different way of
sharing and organizing photos also integrated different social
networking sites.
https://www.flickr.com/services/api/

5. ●
LinkedIn API
https://developer.linkedin.com/
Linkedin is professional social networking site for business working and
making business circle over the network. Linkedin also provide some kind
of similar API like Facebook and Twitter but it’s too professional makes
some difference in this.
There are API’s available like
Wordpress : https://codex.wordpress.org/WordPress_APIs
Salesforce : https://developer.salesforce.com/
Dropbox : https://www.dropbox.com/developers
Pinterest : https://developers.pinterest.com/api_docs/
Netflix : http://www.programmableweb.com/api/netflix
Skype : http://www.skype.com/en/developer/
Telegram : https://core.telegram.org/api
Kayak : http://www.programmableweb.com/api/kayak
Waze : http://www.programmableweb.com/api/waze

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