Assistive technology
Software or hardware that mediates between the user and the operating system or a web page, translating between the platform's accessibility tree and a modality the user can perceive or operate.
Common AT includes screen readers (NVDA, JAWS, VoiceOver, Orca, Narrator, TalkBack), screen magnifiers (ZoomText, macOS Zoom), switch devices and voice-control software (Dragon, VoiceOver Voice Control), and braille displays. Each AT consumes the operating system’s accessibility API; engines populate that API by walking the accessibility tree built from the DOM and ARIA attributes.