Okay kiddo, a personality is how a person thinks, feels, and behaves. When someone has a personality disorder, it means that their way of thinking, feeling, and behaving is different and it causes problems in their life and how they interact with others.
There are many different types of personality disorders, but I'll just tell you about a few. One type is called borderline personality disorder. This means that a person has a hard time controlling their emotions and sometimes they react really strongly to things that other people might not react so strongly to.
Another type is called narcissistic personality disorder. This means that a person thinks they're better than everyone else and they often try to get attention or admiration from others.
Sometimes, people with a personality disorder might not even realize that they have a problem. And even if they do realize it, it can be hard for them to change their way of thinking and behaving.
But it's important to remember that having a personality disorder doesn't make someone a bad person. They might just need some extra help and support to learn new ways of coping and interacting with others.