What is web accessibility?

According to the Web Accessibility Initiative, web accessibility means that websites, tools, and technologies are designed and developed so that people with disabilities can perceive, understand, navigate, interact with and contribute to the Web.  It also benefits people without disabilities, including older people whose abilities are changing due to age. Web accessibility encompasses any disability that affects access to the Web, including visual, auditory, physical, speech-related, cognitive and neurological disabilities. (source :