DirectX is a basic component for the performance of graphics and sound on your computer. If you also play as usual, you'll know that without DirectX you have nothing to do.
It contains the multimedia libraries that are responsible for setting up and coordinating all the technical equipment needed to run a game, without it you would not see its graphics correctly or you could not directly load the game or you would have sound faults.
To find out if your version of DirectX is the most current or if it fails, you can try the following test:
Start menu > Run: "dxdiag"
After this a graph will appear where you can see if the performance is optimal.
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