It is a set of routines, data structures, object classes and/or protocols provided by libraries and/or operating system services in order to support the building of applications. An API may be:
- Language-dependent; that is, available only in a particular programming language, using the particular syntax and elements of the programming language to make the API convenient to use in this particular context.
- Language-independent; that is, written in a way that means it can be called from several programming languages (typically an assembly/C-level interface). This is a desired feature for a service-style API that is not bound to a particular process or system and is available as a remote procedure call.
The API acronym may sometimes be used as a reference not only to the full interface but also to a single function or even a set of multiple APIs provided by an organization. Thus the scope is usually determined by the person or document that communicates the information.
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