DirectX is a collection of application programming interfaces (APIs) for handling multimedia, especially game programming and video, on Microsoft platforms. It is a key component of the Windows operating system and is used by many games and other multimedia applications.
To check which version of DirectX is installed on your computer, you can use the DirectX Diagnostic Tool (DXDiag). To do this, press the Windows key + R to open the Run dialog box, then type “dxdiag” and press Enter.