The Web is designed as a universal space. Its universality is its most important facet.
Tim Berners-Lee, W3C Director and inventor of the World Wide Web

People are diverse. They use different computers, different software; they have varying levels of eyesight, hearing, dexterity, neurological function, and cognitive ability – this may be due to a permanent impairment, injury, or simply aging. Software agents such as search engine bots also have accessibility needs. So do you.

Inaccessible web pages are badly written. They disable people. The W3C's Web Accessibility Initiative brings together people from industry, disability organisations, government and research labs to devise protocols and guidance to make the Web accessible to everyone, anywhere, on any device.