Dynamic Link Library (DLL)

A Dynamic Link Library (DLL) is a file used by Windows programs that contains reusable code and resources. Instead of every program copying the same functions, they can call on a DLL when needed, saving space and making updates easier. Think of a DLL as a toolkit shared by multiple applications—each can use the tools (functions) it contains without having to store their own copies. This approach improves efficiency, reduces redundancy, and simplifies maintenance since updating the DLL updates all programs that rely on it automatically.