API is a set of instructions, which programmers can use to access web-based applications or tools. Software companies release APIs to the general public so that other programmers and developers can design products that are powered by its services.
Two examples of this would be Amazon and eBay. Since both companies release an API, developers can easily tap into Amazon or eBay's product listings, and have these products listed on a third- party website. The third-party website could embed links to these sites where purchases could be made directly, instead of visiting both sites independently.
REST APIs that adhere to the REST architectural constraints are commonly referred to as being RESTful.
The following ...