Racism is when people treat others unfairly or say mean things to them just because they look different or come from a different background. Imagine you're playing a game with your friends, and you're all supposed to have fun and be happy together. But if someone starts being mean to one person just because they have different skin color or come from a different place, it breaks the game. It makes the person who is being treated badly feel sad and not want to play anymore. It also makes everyone else feel upset and not have fun anymore. In games, just like in life, we should all be kind and treat each other with respect, no matter how we look or where we're from. So, when people are racist, it makes the game, and everything else, not enjoyable for anyone.