The article discusses the two concepts usability and accessibility as they pertain to websites and website design. Although I thought the writing style was clunky and not particularly readable, especially by a non-techie, the author made some important points, with the most concise and pertinent point being this one:
. . .Usability is mostly about the methods of making the navigation more facile while accessibility is about making the navigation possible for everyone. The difference is simple: a usable website is “user-friendly” while an accessible website is “all users-friendly.”
Food for thought indeed.