A mouse acceleration feature accelerates the motion of your pointer. It enables users to move their pointer faster and cover more on-screen distance with merely a faster mouse movement rather than the physical distance the mouse covers.
What is the point of mouse acceleration?
Windows 10's mouse acceleration is a feature that makes your cursor move based on speed rather than the physical distance you move your mouse. For example, you can slowly move your mouse across your entire table and it still won't cover as much distance on your screen as one small but fast movement.
Is it good to have mouse acceleration on?
While some people might like mouse accel and turn it on in their (ingame) settings, a good gaming mouse should never have built in acceleration which can't be turned off, as the majority of gamers will not want anything impacting their aim. Having good, precise aim in any game is all about muscle memory.