How can I teach my kindergarten students about a classmate that has Autism?

I have a student in my kindergarten class with Autism and the other children are having a hard time dealing with it. I believe it is because they don’t understand why he does certain things. How can I explain Autism to kindergarten? Also, are there any activities that I could do with them to simulate the problems that some face with Autism?
Thank you all so much for the answers! I really appreciate your help!

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