API
An API is an interface that allows software systems or components to exchange functions or information through defined rules
What it means, how it is used and where it comes up, with its related concepts.
What it is and how it works
It makes it easier to integrate services without knowing every detail of their implementation. Using one requires attention to formats, permissions, errors and limits. For example, a website can check availability in another system and present the result to the user.
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