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A Dynamic Link Library (DLL) is a shared program module with ordered code, methods, functions, enums and structures that may be dynamically called by an executing program during run time. A DLL usually has a file extension ending in .dll. Other file extensions are .drv and .ocx.

DLLs were developed by Microsoft and work only with the Windows operating system (OS).

Source: https://www.techopedia.com/definition/24835/dynamic-link-library-dll