Hunting is going out to find and kill animals. Animals, and some humans, hunt for food. Other humans do it for fun. Many places have rules that limit hunting. People have hunted at least since the stone age. They used spears, and now people mostly use guns. Some people kill the animals for fur, to make clothes and shelter, or to decorate their homes, or to sell.
Hunting can be good by keeping animal populations from getting too high. Hunting too much, though, can kill off species of animals, making them extinct. Hunting once made the dodo, a bird, become extinct.