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A DLL is a library that contains code and data that can be used by more than one program at the same time. For example, in Windows operating systems, the Comdlg32 DLL performs common dialog box related functions. Therefore, each program can use the functionality that is contained in this DLL to implement an Open dialog box. This helps promote code reuse and efficient memory usage.
http://support.microsoft.com/kb/815065
The full name of dll is Dynamic Link Libraries.. A single dll is consist of code and data. Such dll used by many programs in the computer at the same time.