During the first week of April, people all over the UK will be marking Autism Awareness Week.
Autism is a lifelong developmental disorder that affects how people perceive the world and interact with others. This can mean they see, hear and feel the world differently to others.
Autism is what is known as a spectrum condition, meaning it affects individuals in different ways. Some autistic people, for example, also have learning disabilities, mental health issues or other conditions.
Some famous faces with autism include TV presenter Chris Packham, actors Daryl Hannah and Dan Akroyd, and musician Gary Numan.