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A DLL (Dynamic Link Library) is a file containing code and data that can be used by multiple programs at the same time, primarily in Microsoft Windows environments. These libraries are crucial for sharing code, as they allow applications to call upon functions in the DLL without needing to include the code directly in their own executable files. This approach saves disk space and memory, as the code is only loaded when needed and can be shared across multiple programs, making applications run more efficiently.

How DLLs work

Shared code: A single DLL can contain code for a specific task, such as creating a dialog box or handling a printer, and multiple programs can use it simultaneously.

Runtime loading: DLLs are loaded into memory only when a program requests them, which is called dynamic linking. This contrasts with static linking, where the code is copied directly into the program during compilation, making the executable file larger.

Modularity: DLLs enable a modular software architecture. If a bug is found in a DLL, it can be updated and redistributed separately without having to recompile the entire application.

Examples: DLLs are used for a variety of functions, including device drivers, operating system components, and plugins.