Accessibility Checker: Software tools that evaluate digital content against accessibility standards and identify potential issues.

Accessible Rich Internet Applications (ARIA): A set of attributes that define ways to make web content and applications more accessible to people with disabilities.

Accommodation: A modification or adjustment to a task, environment, or way of doing things that enables an individual with a disability to have equal access.

Alternative Text (Alt Text): Descriptive text added to images that screen readers can read aloud to describe the image to users who cannot see it.

Assistive Technology (AT): Hardware or software used by people with disabilities to perform functions that might otherwise be difficult or impossible.

Braille Display: A tactile device that allows blind or visually impaired users to read text output in braille.

Breadcrumb Navigation: A secondary navigation system that shows users their location within a website's hierarchy, improving orientation for all users.

Captions: Text versions of audio content in videos, synchronized with the video and audio tracks. Closed captions can be turned on or off, while open captions are always visible.

Color Contrast: The difference in light between foreground content (such as text) and its background. Sufficient contrast is necessary for people with low vision or color blindness.

Content Management System (CMS): Software used to create and manage digital content, which may have built-in accessibility features.

Digital Accessibility: The practice of ensuring digital content and technologies can be used by people with disabilities.

Document Structure: The organization of a document using proper headings, lists, and other formatting elements that provide navigation cues for assistive technology users.

Electronic and Information Technology (EIT): Any equipment or interconnected system used to create, convert, duplicate, or access information and data.

Equivalent Alternative: Content presented in a different format that serves the same function for users who cannot access the original format.

Focus Indicator: A visual cue (often a border or highlight) that shows which element on a screen currently has keyboard focus.

Form Labels: Text that identifies the purpose of form controls (like text fields, checkboxes, and buttons) to all users, including those using screen readers.

Heading Structure: The hierarchical organization of content using heading levels (H1, H2, H3, etc.) that provides a semantic outline of the page content.

Inclusive Design: Design that considers the full range of human diversity with respect to ability, language, culture, gender, age, and other forms of human difference.

JAWS (Job Access With Speech): A popular screen reader program used by people with visual impairments.

Keyboard Accessibility: The ability to navigate and interact with a website or application using only a keyboard, without requiring a mouse.

Live Captions: Real-time text that appears on-screen during a live presentation or event, making the audio content accessible to deaf or hard-of-hearing individuals.

Logical Reading Order: The sequence in which content should be read to make sense, which should match the visual layout for users of assistive technologies.

Magnification: Enlarging text, images, and other screen elements to make them more visible for users with low vision.

Multimedia: Content that combines multiple forms such as text, audio, images, animations, or video.

NVDA (NonVisual Desktop Access): A free, open-source screen reader for Windows.

Optical Character Recognition (OCR): Technology that converts images of text into machine-readable text, making scanned documents accessible to screen readers.

PDF/UA (PDF/Universal Accessibility): A technical standard for accessible PDF documents.

Perceivable: The first principle of WCAG, requiring that information and user interface components must be presentable to users in ways they can perceive.

Responsive Design: Web design approach that makes web pages render well on a variety of devices and window or screen sizes.

Remediation: The process of modifying existing content to make it accessible.

Screen Reader: Software that reads digital text aloud, allowing blind or visually impaired users to access digital content.

Semantic HTML: Using HTML elements according to their intended purpose, which improves accessibility by conveying meaning to assistive technologies.

Skip Navigation: A link at the beginning of a page that allows keyboard users to bypass repetitive navigation elements and go directly to the main content.

Transcript: A text version of audio content, providing access for deaf or hard-of-hearing users and those in noisy environments.

Universal Design: The design of products and environments to be usable by all people, to the greatest extent possible, without the need for adaptation or specialized design.

User Agent: Software that retrieves and presents web content for users, such as web browsers, media players, and assistive technologies.

VoiceOver: The screen reader built into Apple's macOS and iOS operating systems.

WCAG (Web Content Accessibility Guidelines): Internationally recognized guidelines for making web content accessible, organized under four principles: Perceivable, Operable, Understandable, and Robust.

Web Accessibility Initiative (WAI): A project of the World Wide Web Consortium (W3C) that develops guidelines and resources to help make the web accessible.

Zoom: The ability to increase the size of all content on a screen, as opposed to just text, benefiting users with visual impairments.