Quick Answer
An accessibility audit is a structured evaluation of a website, application, or digital document to identify barriers that prevent people with disabilities from accessing digital content. A complete accessibility audit combines automated tools, manual keyboard testing, screen reader testing, mobile accessibility testing, and expert review against WCAG 2.2 success criteria to produce prioritized remediation guidance. According to the WebAIM Million report, an annual review of the top one million website home pages, the large majority contain detectable WCAG failures — which is why automated scans alone are never treated as a complete audit.