Kharku is a Punjabi word that means "rebel" or "revolutionary." It is used to describe people who fight against the government or the authorities in order to make a change. So, imagine you and your friends are playing a game and you don't like the rules. You might become a kharku and try to change the rules to make the game more fair. In the same way, people who want to change things in their country might become kharkus and try to change the way things are done. However, it's important to remember that being a kharku can be dangerous and it's usually better to fight for change peacefully.