DirectX is a suite of multimedia technologies required by many Windows games. If your PC doesn't have the right version of DirectX installed (the product box should tell you which one you need), your game might not work properly.
DirectX is a set of components in Windows that allows software, primarily and especially games, to work directly with your video and audio hardware. Games that use DirectX can use multimedia accelerator features built-in to your hardware more efficiently which improves your overall multimedia experience.
This tutorial will show you how to find the DirectX version you have in Windows 10 and Windows 11.
Press the Win + R keys to open Run, type dxdiag into Run, and click/tap on OK to open the DirectX Diagnostic Tool.
The first time you use the DirectX Diagnostic Tool, you might be asked whether you want to check if your drivers are digitally signed. It is recommend that you select Yes to help ensure that your drivers have been signed by a publisher that has verified their authenticity.
Click/tap on a System tab in the DirectX Diagnostic Tool. (see screenshot below)
You will see the DirectX Version (ex: "DirectX 12") listed under System Information.