A diss track is a song or a type of music where someone creates lyrics that say mean things about someone else. It's like when you get really mad at your sibling or a friend and you want to say mean things to them, but instead of just saying it, you put it into a song. The song can be about anything, like how their clothes look stupid or how they are bad at something. People usually make diss tracks when they have a problem with someone else and they want to show other people how mean that person is. It's like when you tell your parents that your brother or sister did something wrong and you want them to know about it. Some people think diss tracks are funny, but others think they are mean and shouldn't be made.