The Windows API, informally WinAPI, is Microsoft's core set of application programming interfaces (APIs) available in the Microsoft Windows operating systems. The name Windows API collectively refers to a number of different platform implementations that are often referred to by their own names (for example, Win32 API); see the versions section. Almost all Windows programs interact with the Windows API; on the Windows NT line of operating systems, a small number (such as programs started early in the Windows startup process) use the Native API.
Developer support is available in the form of the Windows SDK, providing documentation and tools necessary to build software based upon the Windows API and associated Windows interfaces.
Read more about Windows API: Overview, History, Versions, Other Implementations, Compiler Support
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