Okay, so imagine you have a bunch of toys in a box. You can only take out a certain number of toys from the box. Let's say you can only take out three toys. That means your set, or the group of toys you take out, is a finite set because it has a limit, which is three.
A finite set is a group of things that has a specific number of things in it, and that number is not infinity. It could be just one thing or a hundred things, but there is a limit to how many things can be in the set. It's kind of like a toy box that can only hold a certain number of toys.
Hope that helps explain it!