About Html5

HTML is the markup language used to describe content, or data, on the World Wide Web.

HTML5 is the latest iteration of that markup language, and includes new features, improvements to existing features, and scripting-based APIs.

Html5 transform the current markup structure of <div>s into a more semantic system using new HTML5 structural elements like <nav>, <header>, <footer>, <aside>, and <article>.
Related Tutorial
6. <nav>
7. <aside>
10. <article>