Okay kiddo, so you know how sometimes you feel like you have to wash your hands a lot when they aren't even dirty, or maybe you have to do a certain routine before you go to bed every night? Well, some people feel like that all the time and it's called obsessive-compulsive disorder or OCD for short.
Basically, it's like having a brain that can't stop thinking about certain worries or fears that make you feel really anxious. These worries are called obsessions, and they can be about all sorts of things like germs, safety, or orderliness.
Now, the way people with OCD try to deal with these worries is by doing certain actions or behaviors over and over again. These behaviors are called compulsions, and they can be things like cleaning, counting, or checking things over and over again.
The problem is that although these actions might make a person feel better for a little bit, it's usually only temporary. They end up feeling trapped and like they have to keep repeating the same behaviors all the time to stop feeling anxious.
OCD can make it really hard for people to do everyday things like going to school, hanging out with friends, or even just relaxing. But the good news is that there are ways to deal with it, like therapy and sometimes medication, that can help people manage their obsessions and compulsions so they can enjoy their lives like everyone else.