Mouse acceleration means to change your mouse pointer move rate to let you have good experience.
But you may find it doesnt do like this especially when you are playing games.
Then, you want to disable it.

What Is Mouse Acceleration?
Mouse acceleration is a Windows built-in feature.
It can change yourmouse pointermove rate according to the speed you move your mouse.
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This feature is enabled by default on your system.
At first sight, you may think this feature is useful for improving the efficiency of your operation.
In this respect, it affects your normal play in the game.
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Fortunately, you’ve got the option to disable mouse acceleration on your gear to avoid this situation.
You just need to uncheck the Enhance pointer precision option in tweaks on Windows.
It is not a difficult work to turn off mouse acceleration on your Windows or Mac computer.
This post shows you some useful guides as follows.
How to Disable Mouse Acceleration on Windows 10?
How to fix the laggy mouse?
This post shows you some simple methods.
How to Turn off Mouse Acceleration on Mac?
Unlike Windows, you oughta use Terminal on Mac to execute some commands to change the mouse acceleration setting.
If you dont know it, you’re free to read this post to get some useful information.