Dynamic Link Library, a library of executable functions or data
that can be used by a Windows application. Typically, a DLL provides one or
more particular functions and a program accesses the functions by creating
either a static or dynamic link to the DLL. A static link remains constant
during program execution while a dynamic link is created by the program as
needed. DLLs can also contain just data. DLL files usually end with the
extension .dll,.exe., drv, or .fon.
A DLL can be used by several applications at the same time. Some DLLs are
provided with the Windows operating system and available for any Windows
application. Other DLLs are written for a particular application and are
loaded with the application.
Delay Locked Loop, Delay-Locked Loop (DLL) supports
high-bandwidth data rates between devices. These DLLs are circuits that
provide zero propagation delay, low-clock skew between output clock signals
throughout a device, and advanced clock domain control. These dedicated DLLs
can be used to implement several circuits that improve and simplify system
These are just a few samples of what DLL stands for. To learn more, Google DLL and you will see that DLL stands for hundreds of different meanings.