Okay kiddo, so fuzzballs are actually a science thing! They are tiny little things that scientists think could be floating around in space. Imagine a really small ball of fuzz, like the kind that collects in your pockets sometimes. Now imagine that ball is made up of teeny tiny strings that are all tangled up together.
Scientists think that fuzzballs are made up of these tangled strings and they could be all over the universe! They also think that fuzzballs might be what the center of a black hole is made up of. But this is just a theory and they are still trying to figure it all out.
So, basically, fuzzballs are little balls of tangled strings that might be floating around in space and could help us understand more about black holes. Pretty cool, huh?