In computing, DLL stands for "Dynamic Link Library". It is a file format used on Microsoft Windows operating systems to store code and data that can be shared by multiple programs at the same time.

A DLL file contains compiled code that can be called by a program to perform a particular function or set of functions. The use of DLLs allows programs to be modular and more easily maintainable, as changes to a DLL can be made without requiring changes to all the programs that use it.

DLL files can contain a wide variety of code and data, from simple utility functions to entire graphical user interfaces. Common DLLs include those that provide access to hardware devices, perform cryptographic operations, or provide network connectivity.

When a program needs to use a DLL, it loads the DLL into memory and calls the appropriate functions in the DLL to perform the desired tasks. This makes the program smaller and faster, as it does not need to include all the code necessary to perform every possible function.
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