WCAG stands for Web Content Accessibility Guidelines, the main international benchmark for making web content usable by people with disabilities. It covers practical checks such as text contrast, keyboard navigation, semantic structure, captions, and compatibility with screen readers and other assistive tools.
In cyber security, WCAG matters because inaccessible services can become unavailable in practice even when the site is online. Users may be unable to complete logins, read security notices, or verify official documents, which weakens service integrity and pushes people toward unsafe workarounds or fake support channels. Defenders use WCAG as part of secure development and quality assurance: they test templates, forms, PDFs, and workflows before release, not after complaints arrive. In real environments, WCAG compliance helps keep public portals, identity systems, and incident communications usable, resilient, and trustworthy.