The <nav> element defines a set of navigation links.-

Notice that NOT all links of a document should be inside an <nav> element. The <nav> element is intended only for a major block of navigation links.

Browsers, such as screen readers for disabled users, can use this element to determine whether to omit the initial rendering of this content.

Example:-
A set of navigation links,

<nav>
 <a href="/html/">HTML</a> |
 <a href="/css/">CSS</a> |
 <a href="/js/">JavaScript</a> |
 <a href="/jquery/">jQuery</a>
</nav>