What is web accessibility?
Accessibility means that the pages on your web site are accessible to any user, not just a sighted user who looks at your pages.
A blind user may access your site with a screen reader or, perhaps, a braille writer. A person with limited mobility may have difficulty or be completely unable to use a mouse. By making your site accessible these users are not locked out of your web site.
This is important for three reasons
By utilising web standards it is easier to make a site accessible.
By following the W3C Web Accessibility Initiative guidelines we can produce a site which is likely to be accessible to as many people as possible./
There is no human problem which could not be solved if people would simply do as I advise.