From the W3C:
Web Content Accessibility Guidelines (WCAG) 2.0 covers a wide range of recommendations for making Web content more accessible. Following these guidelines will make content accessible to a wider range of people with disabilities, including blindness and low vision, deafness and hearing loss, learning disabilities, cognitive limitations, limited movement, speech disabilities, photosensitivity and combinations of these. Following these guidelines will also often make your Web content more usable to users in general.
WCAG 2.0 success criteria are written as testable statements that are not technology-specific. Guidance about satisfying the success criteria in specific technologies, as well as general information about interpreting the success criteria, is provided in separate documents. See Web Content Accessibility Guidelines (WCAG) Overview for an introduction and links to WCAG technical and educational material on the W3C/WAI web site.
WCAG 2.0 succeeds Web Content Accessibility Guidelines 1.0 [WCAG10], which was published as a W3C Recommendation May 1999. Although it is possible to conform either to WCAG 1.0 or to WCAG 2.0 (or both), the W3C recommends that new and updated content use WCAG 2.0. The W3C also recommends that Web accessibility policies reference WCAG 2.0.
The DDA was introduced with the intention of comprehensively tackling the discrimination which many disabled people face. The main part of the DDA that applies to websites and requires them to be accessible came into force in October 1999 with Further amendments following in 2005.
Service providers (including providers of education) are required to provide auxiliary aids and services where this would enable or make it easier to use a service. (this includes accessible websites)
The presentation delivered during this event can be viewed by visiting
The Benefits of WCAG 2.0 on the W3C web site.