Autism is a way of processing information in the brain that can make it harder to understand and interact with the world. People with autism might have trouble with things like communicating or making friends.
Memory is like a bookshelf in your brain where you put things you want to remember. When you learn something new, your brain puts it on a shelf in your memory so you can remember it later.
For people with autism, their memory bookshelf might work a little differently. Sometimes their memory bookshelf can get really full and things can get mixed up, which can make it hard to remember things they want to remember. It can also be harder for them to remember things that happened a long time ago or things that happened really quickly because their memory bookshelf might not have had time to put it in the right place.
But just like how some people might have trouble with math or sports, some people with autism might have a really good memory bookshelf and be really good at remembering things they are interested in. It's just all about how their brain works!