Insect fighting is like having a competition between bugs! People will pick two bugs that are the same kind, like two crickets or two beetles, and they will put them in a small container. Then, the bugs will fight each other until one of them wins.
But don't worry, it's not a mean thing to do to the bugs. They don't really hurt each other, and they might even enjoy it! Some people use insects fighting as a way to understand how they behave and how they interact with each other.
It's important to remember to only do insect fighting with bugs that are safe to handle and not poisonous. And if you decide to do an insect fight, make sure to let the bugs go afterwards so they can continue living their lives as normal.