Okay, kiddo, imagine you have a ball that you want to play with, but someone else wants to play with it too. You share the ball with them but you realize too late that they have a big hole in their pocket and now the ball is lost forever. That's kind of like how HIV works.
HIV is a virus that can be passed from one person to another through certain body fluids like blood, semen, vaginal fluids, and breast milk. But unlike a ball, it's not visible, and most people don't know they have it because it doesn't always show symptoms right away.
Now, imagine that someone knows they have HIV and they still have sex or share needles with other people without telling them they have the virus. That's not fair or nice, is it? It's actually a crime to purposely pass on HIV to someone else without telling them because it puts the other person's health and life in danger.
This crime is called criminal transmission of HIV. It's important to remember that many people with HIV take medicine that can keep the virus under control and make it hard to pass on to others, so not everyone with HIV will be able to pass it on even if they have sex or share needles. But still, it's important to always be honest with others about your health so they can make informed decisions about their own safety.