>Represents navigation for a document. The nav element is a section containing links to other documents or to parts within the current document.
>Not all groups of links on a page need to be in a nav element — only **groups of primary navigation links**. In particular, it is common for footers to have a list of links to various key parts of a site, but the footer element is more appropriate in such cases._
Nav and footer tags can be used multiple times on a page in HTML5, albeit it really doesn’t make much sense to use them multiple times. The same is true of header tags so long as they’re wrapped in a section or article tag.