What is web accessibility?

According to the World Wide Web Consortium (W3C), web accessibility ensures that people with disabilities can use the web: “web accessibility means that people with disabilities can perceive, understand, navigate, and interact with the web, and that they can contribute to the web.” 

Web accessibility assessment must encompass visual, auditory, physical, speech, cognitive, and neurological disabilities. 

Why is web accessibility important? 
Creating an accessible website is just the right thing to do. Everyone should be able to get the full value and utility out of your website regardless of the abilities they have. And making the web more accessible improves it for everyone.