API stands for “Application Programming Interface” for software system API is a group of programs, methods, and resources for building computer programs. APIs allow developers easier access into service or another firm’s plan.

It allows the programmers to apply predefined functions to communicate with the operating system excepting of writing them. All computer operating systems, such as Windows, UNIX, and the Mac OS, provide an application program interface for programmers and they have similar interface.

For Example, towns and big businesses including Facebook and Facebook have APIs that enable site designers or developer’s easier use of people and their services.

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The computer mouse as we know it today was invented and developed by Douglas Engelbart, with the assistance of Bill English, during the 1960’s and was patented on November 17, 1970