This document defines web accessibility, demonstrates how different groups access the web while facing various disabilities, and tests web accessibility. It highlights the types of disabilities affected by lack of accessibility, including physical and technological impairments. Examples are given of how people access the web using assistive technologies like screen readers and magnifiers. The document recommends meeting level AA of the WCAG guidelines for UK government sites and provides a link to test accessibility. Benefits of accessibility like increasing market share and reducing legal liability are briefly outlined.