Accessibility
What is it? How does it affect me?
The R.N.I.B. says "Accessibility is the degree to which anyone can access and use a website using any web browsing technology. A fully accessible site is one that is designed to make use of the latest web technologies such as multimedia, while at the same time accommodating the needs of those who have difficulty with or are unable to use these technologies.
Accessibility is about flexibility in design. Designers need to think in terms of providing more than one way of doing things on a website, so that if a user is unable to use one method, other options are available to them.
Accessibility is also about avoiding myths and assumptions about how and why people use the web. It may surprise you to learn that accessibility benefits everyone who uses your website, not just people who have a disability.
A website that is accessible will provide the same level of experience to everyone who visits it, regardless of his or her level of ability or disability."
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Llewellyn Smith