The Web Content Accessibility Guidelines (WCAG) are a set of internationally recognized standards published by the W3C that define how to make web content accessible to people with visual, auditory, motor, and cognitive disabilities. WCAG guidelines are organized around four principles: Perceivable, Operable, Understandable, and Robust. Compliance levels range from A (minimum) to AAA (highest). WCAG compliance is closely aligned with ADA requirements in the United States and is both a legal consideration and a best practice for inclusive web design.