Dxdiag stands for DirectX Diagnostic Tool. It’s used to manage DirectX installation. DirectX is an application programming interface (API) that developers use to create applications dealing with multimedia or graphics on Windows operating systems.
The DirectX Diagnostic Tool allows you to view an overview of DirectX on the system. You can view how DirectX is used for your display, sound, or input to the computer. If you’re having issues with graphics or sound, you may want to run diagnostic tests from within the DirectX Diagnostic Tool.
The DirectX Diagnostic Tool can be opened by typing dxdiag at the command line.
