Digital information and services have the potential to bring an unprecedented level of independence to people with disabilities, but only if our systems and content are built with accessibility in mind. Accessibility does not happen by accident. It must be purposefully planned, built, and tested. Inaccessible services deprive users with disabilities of experiences and opportunities that other people take for granted. This module explores the needs of people with disabilities and provides important background information about accessibility guidelines, laws, and rationale.