DLL - Dynamic Link Library
DLL refers to a type of file that is stored either locally or remotely and is a collection of commands and/or data which can be shared by different programs on the same platform.
Typical DLL files contain commands and/or data that are common to a certain task, for instance Windows has many DLL files built-in which other programs access and utilise. A common example of this is spool32.dll which is used for printing control within Windows 95/98 by other applications.
The one time you may become aware of DLL files is when your computer crashes and you are presented with a message such as an "invalid page fault".
The errors associated with DLL files are beyond the scope of this page, however, DLL files can be updated and most of the time a problem can be solved by updating the DLL file in question.