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What is the necessity to have API?

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What is the necessity to have API?

(a) Guide to performing activities

(b) Describe particular task

(c) Both performing activities and Describe particular task

(d) Rearrangement of tasks

I have been asked this question in an interview for job.

Enquiry is from HTML APIs topic in portion Caching, Debugging and Animation of JavaScript

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The correct answer is (b) Describe particular task

To elaborate: In computer programming, an application programming interface is a set of subroutine definitions, communication protocols, and tools for building software. An API may describe the ways in which a particular task is performed.

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