A-Z Accessibility Glossary
Definitions and context for digital accessibility and regulatory terminology.
EAA
European Accessibility Act. Formally Directive (EU) 2019/882, it mandates accessibility for products and services across the EU.
WCAG
Web Content Accessibility Guidelines. The international standard for web accessibility published by the W3C Web Accessibility Initiative (WAI).
EN 301 549
The harmonised European standard for the accessibility of ICT products and services, used for public sector compliance and the EAA.
SCA
Strong Customer Authentication. A requirement of PSD2/PSD3 for payment security, often requiring accessible MFA solutions.
ARIA
Accessible Rich Internet Applications. A set of attributes that define ways to make web content and web applications more accessible by providing semantic information to assistive technologies.
SC
Success Criterion. A specific, testable accessibility requirement defined within the WCAG framework.
AEO
Answer Engine Optimization. The practice of optimizing content to be accurately understood and retrieved by AI-powered search and answer engines.
APCA
Accessible Perceptual Contrast Algorithm. A modern method for calculating color contrast based on human perception, proposed for WCAG 3.0.
ADA
Americans with Disabilities Act. A US civil rights law that prohibits discrimination against individuals with disabilities in all areas of public life.
ACR
Accessibility Conformance Report. A document that explains how a product or service conforms to accessibility standards like WCAG or Section 508.
VPAT
Voluntary Product Accessibility Template. A standardized template used to generate an Accessibility Conformance Report (ACR).
Section 508
A US law requiring federal agencies to make their electronic and information technology accessible to people with disabilities.
GDPR
General Data Protection Regulation. An EU regulation on data protection and privacy in the European Union and the European Economic Area.