Autism is a pervasive developmental disorder that affects children's brains and normal development. While the exact cause is unknown, it is considered a non-transmittable condition present from birth, not an illness that can be passed from one person to another. Autism mostly impacts boys under age 5 and is characterized by difficulties with pretend play, social interaction, communication skills, and repetitive behaviors. There is no cure for autism, but treatments like visual aids, dietary changes, therapy, and applied behavioral analysis can help manage symptoms, though none are considered miracle cures.