Glossary

Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.

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Icon(also: Icons, UI Icon): A small graphical symbol used in graphical user interfaces (GUIs) to represent an application, file, function, or object. Icons rely on visual recognition rather than text reading, which can be both an advantage and a barrier for users with visual impairments depending on…
Image-Based Interface(also: Photo-Based Interface, Picture-Based Interface): A user interface design approach that uses photographs, icons, or other visual images as the primary means of interaction and identification, minimizing or eliminating the need for text. Image-based interfaces are particularly valuable for users with cognitive disabilities, low…
In-situ Highlighting(also: In-situ Guidance, In-situ Instruction, On-screen Highlighting): In-situ highlighting is a tutorial technique that overlays visual indicators directly on the live application interface to show the user exactly where to tap, look, or interact next - rather than describing the action in a separate text or video tutorial. Common implementations…
Interactive Television(also: iTV, Interactive TV): Interactive television (iTV) refers to television systems that allow viewers to interact with content beyond simply watching, through features such as voting on polls, accessing supplemental information, navigating menus, and using applications displayed on the TV screen. iTV…

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