The international Web Accessibility Initiative (WAI) defines Web accessibility as follows:
"Web accessibility means that websites, tools, and technologies are designed and developed so that people with disabilities can use them. More specifically, people can: perceive, understand, navigate and interact with the Web, and contribute to the Web. Web accessibility also benefits people without disabilities, for example older people with changing abilities due to ageing. Web accessibility encompasses all disabilities that affect access to the Web, including: visual, auditory, physical, speech, cognitive and neurological disabilities."