Dynamic-link library facts for kids

A Dynamic-link library (often called a DLL) is a special type of computer file used by Microsoft Windows computers. Think of it like a shared toolbox for computer programs. Instead of every program having its own copy of tools, they can all share tools from a DLL file. This saves space and makes programs run more smoothly.

These files usually end with extensions like DLL. Sometimes, you might see OCX for files that help with interactive parts of programs, or DRV for older files that help your computer talk to its hardware, like a printer or a mouse.

Some DLL files are called resource DLLs. These files hold things like icons (the little pictures you click on) or fonts (the different styles of letters you see). For example, icon libraries might end with ICL, and font files might end with FON or FOT.

How DLLs Help Your Computer

DLLs are super helpful because they let many programs use the same code at the same time. Imagine you have a game and a drawing program. Both might need to do something similar, like saving a file. Instead of each program having its own "save file" instructions, they can both use the same instructions from a DLL.

Why Programs Use Shared Libraries

Using shared libraries like DLLs has several benefits:

• Saves Space: Programs don't need to carry all their tools inside them. They can share tools from DLLs, which makes the programs smaller.
• Easier Updates: If a tool in a DLL needs to be fixed or improved, only the DLL file needs to be updated. All programs that use that DLL will automatically get the update without needing to be reinstalled.
• Faster Loading: When a program starts, it can load only the parts of the DLL it needs, which can make the program open faster.

Common DLL Uses

DLLs are used for many things in Windows:

• System Functions: Many basic operations of Windows, like opening windows or managing files, are handled by DLLs.
• Device Drivers: These are special DLLs that help your computer communicate with hardware like printers, keyboards, and webcams.
• Game Components: Games often use DLLs for graphics, sound, or physics engines.
• Software Plugins: Some programs use DLLs as "plugins" to add new features.

What Happens If a DLL Is Missing?

Sometimes, you might see an error message saying a DLL file is missing. This usually means a program can't find a tool it needs to run. This can happen if:

• The DLL file was accidentally deleted.
• The program was not installed correctly.
• There's a problem with your computer's system files.

If you see such an error, reinstalling the program or updating your computer's drivers can often fix the problem.

See also

In Spanish: Biblioteca de enlace dinámico para niños