article vs div in html5 code example

Example: uses of div, section and article tag in html

<span> - used to stylize a very small part of text by CSS(Cascading Style Sheets).
   <div> - groups content, used mainly to add a class to a groups of different tags and apply CSS.
   <section> - groups related content, helps the  disabled people to communicate to the computer through the assistive technology , forexample: for the screen readers.etc
   <article> - groups independent, self-contained content, helps the  disabled people to communicate to the computer through the assistive technology , forexample: for the screen readers.etc