When people refer to "Autism" today, they are usually talking about Autism Spectrum Disorders (ASD), which is a brain-based disorder characterized by social-communication challenges and restricted repetitive behaviors, activities, and interests. The Centers for Disease Control describes ASDs as: "a developmental disability that can cause significant social, communication and behavioral challenges. There is often nothing about how people with ASD look that sets them apart from other people, but people with ASD may communicate, interact, behave, and learn in ways that are different from most other people. The learning, thinking, and problem-solving abilities of people with ASD can range from gifted to severely challenged. Some people with ASD need a lot of help in their daily lives; others need less."