Definition for DLL

DLL: A DLL is a Dynamically Linked Library, which is a type of program file that is loaded and executed on demand. This occurs when another controlling piece of software needs the functions or service located in the DLL. It requests that the DLL be loaded into the computer's memory and made available for it to use. DLL's are used by Microsoft Windows. Other operating systems use similar techniques to this for dynamic modules, but may be referred to by a variety of other names.

Glossary