Okay, so you know how sometimes you forget little things like what you had for breakfast or where you put your toy truck? Well, sometimes people can forget really big things like their name, where they live, or even things that happened to them before.
This is called dissociative amnesia. It happens when your brain tries to protect you from a really scary or traumatic event by making you forget it completely. It's like your brain puts the memory in a special, secret box where you can't get to it anymore.
People with dissociative amnesia might not even realize they have forgotten things. They might feel confused or lost because they can't remember important information. But don't worry - sometimes with help from a special doctor called a therapist, these memories can be brought back so the person can understand and deal with them.