Website usability program

These days website usability become main concern in usage of web development,
What does mean website usability?
It is simple to understand, website usability means that a website how easy to use by a normal and minimal IT user,

Whenever we develop a website, we must consider the fact how a user will easily navigate the pages and how user friendly for them, without making the site more complicated to use. For an example we need to have a proper structure in the layout, we must follow a standard navigation.

There is also another main concern about disabled users,  we must also support to develop the website for accessibility users,

Learn more about  accessibility from following link
http://realwebdeveloper.blogspot.com/2014/02/web-accessibility-basic-idea-for-web.html