Metadata

Data that provides structured information about other data or digital content. In accessibility, metadata plays a critical role in describing the accessibility features and characteristics of digital resources — for example, indicating whether a document has alternative text for images, captions for video, or a particular reading level. Accessibility metadata enables assistive technologies, search engines, and content management systems to identify and surface accessible content for users who need it. Standards such as Schema.org accessibility properties and the EPUB accessibility metadata specification provide frameworks for encoding this information consistently.