What Are Dynamic Link Libraries?

DLL Files Allow for Quick and Easy Program Updates
Computer programmers use DLL files as short pieces of code outside the main program. This allows them to update aspects of their programs by simply changing the DLL files. With this modular type of programming, the main body of their program does not have to be modified, only the smaller DLL files.
DLL Files Can Be Shared
Software applications can share DLL files. For example, a small DLL file may contain the necessary computer code to handle printing for a specific brand and model of printer. Any program that requires printing can access that DLL file, so the program doesn't need its own printer files or 'drivers' to handle the many different printers on the market.
DLL Files Save Memory
Programs can use DLL files so they can take up less memory. A program can load a particular DLL to carry out a specific function only when needed. For example, a word processing program may opt to only load computer code to handle printing when the user is actually ready to print a hard copy, thus keeping the computer's memory available for other uses.
DLL File Errors
If a DLL file is missing or corrupt, a program may produce error messages or even fail to run. An error message will most likely report the name of the DLL file that is missing or that it is having trouble loading. You can often download DLL files if they are missing or to fix those already on your system. Use a search engine or check Microsoft's support website.
Locating DLL Files
You will find most DLL files in the Windows directory on your hard drive, usually in the System and System32 subdirectories.