An application programming interface (API) is a set of protocols, routines, and tools that enables different software applications to communicate with each other. It defines how requests for services and data are made between programs, and how responses are returned, often abstracting complex functions into simpler calls. APIs are foundational to modern software development, facilitating integration between systems and allowing developers to build on top of existing platforms or services. Common examples include web APIs that enable data exchange between websites and applications, as well as operating system APIs that allow programs to access system resources.

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