What is an API?
API stands for Application Programming Interface.
A Web API is an application programming interface for the Web.
A Browser API can extend the functionality of a web browser.
A Server API can extend the functionality of a web server.
Browser APIs
All browsers have a set of built-in Web APIs to support complex operations, and to help with accessing data.
For example, the Geolocation API can return the coordinates of where the browser is located.
Click the button to get your coordinates.
Push Me To See Your Current Location
Third Party APIs
Third party APIs are not built into your browser.
To use third party APIs, you have to download the code from the Web.
Examples of Third party API's:
YouTube API - Allows you to display videos on a web site.
Twitter API - Allows you to display Tweets on a web site.
Facebook API - Allows you to display Facebook info on a web site.