nav element - <nav>
The <nav> element defines a section comprising of links used for navigation. It is interesting to note that the HTML specifications states that not all groups of links need to be in a <nav> element; only sections that consist of major navigation blocks. On top of that, the header or footer of a page may consist of navigation blocks which simply require the <header> and <footer> element without the <nav> element.
The diagram below shows where you will typically use the <nav> element. Assistive software products can make use of the <nav> element for example, to go to the contents directly.
The example below shows how to define a navigation bar for a HTML document. Typical use includes table of contents and previous/next buttons etc.
<a href="">Contact Us</a>
<a href="">About Us</a>