My Autism and Me - a Newsround Special
11 February 2015 Last updated at 14:55 GMT
Newsround has made a special programme about autism.
It's a condition that affects the way you live your life and see the world around you.
Our presenter Rosie was born with it. She says even though living with autism is difficult, it makes her unique and who she is.
As well as telling her own story, you'll find out how Ben, Tony and Lenny are affected by the condition.
Lots of children with autism get bullied at school and find it hard to get jobs when they grow up.
In our special film Rosie wants to tell the world what autism is and help people understand what it's like to live with it.