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. Each program can use the functionality that is contained in this DLL to implement an Open dialog box.

What are the responsibilities of DLL?

A DLL helps promote developing modular programs. It helps you develop large programs that require multiple language versions or a program that requires modular architecture. An example of a modular program is an accounting program having many modules that can be dynamically loaded at run-time.

What happens if DLL files are missing?

Some "DLL Is Missing" and "DLL Not Found" DLL errors are related to hostile programs that masquerade as DLL files. ... Reinstall the program that uses the DLL file. If a DLL error occurs when you open or are using a particular program, then reinstalling the program should properly install and register the DLL file again.