Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Alt text(also: Alternative text, Text alternative)
- A textual description of non-text content (primarily images) provided via the HTML alt attribute, read by screen readers and displayed when images cannot be loaded. Required by WCAG Success Criterion 1.1.1 (Level A), alt text should convey the same information or function as the…
- Annotation(also: Web Annotation, Content Annotation)
- The practice of adding supplementary information, notes, or metadata to existing digital content, typically without modifying the original source. In accessibility, annotation is used to add alternative descriptions, labels, structural information, or other accessibility…
- Audio description(also: AD, Described video, Video description)
- Narration added to a media soundtrack that describes important visual information — such as actions, characters, scene changes, and on-screen text — that cannot be understood from the main audio alone. Audio description makes video and live performance content accessible to…
- Augmentative and alternative communication(also: AAC, Alternative communication, Aided communication)
- A range of strategies, tools, and technologies used to supplement or replace spoken or written communication for people who have difficulty producing or understanding speech. AAC encompasses unaided methods (gestures, facial expressions, sign language, body language) and aided…
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