Okay kiddo, have you ever played with a toy that wasn't really yours and pretended it was? That's a bit like what some people do with computers.
Computer fraud is when someone uses a computer to trick others into doing things or giving away things they shouldn't. It's like a big game of pretending, but it's not very nice because it can hurt people and be against the law.
For example, a bad guy might send you an email that looks like it's from your bank, but it's really from them. They might ask you for your login information or ask you to click on a link that takes you to a fake website. If you give them your info, they can use it to steal your money!
Sometimes people can also use computer fraud to take control of other people's computers. They do this by tricking the person into downloading a bad program or clicking on a bad link. Once they have control, they can steal information, spy on the person, or even use the computer to do bad things.
It's like someone pretending to be your friend, but they're really trying to make you do something bad or take something that belongs to you. That's why it's important to be careful on the computer and never give out your information or download things from people you don't trust!