Hey kiddo, do you know what a computer mouse is? It's a little device that we use to move around and click things on our computer screens.
Well, there are some really smart people who use a special tool to watch how we move our mouse when we're using our computers. It's kind of like spying, but it's not bad because we say it's okay for them to do it.
They can learn a lot from watching how we move our mouse. For example, they can figure out if we're having trouble using a website, or if we're really interested in a certain part of a webpage.
They use special software to track how we move our mouse, and then they use that information to make websites and apps better for us to use.
So, mouse-tracking is just a way for really smart people to watch us use our computer mouse so they can make our digital world better and easier to use!