<nav> or <menu> (HTML5)

Question

nav is used for groups of internal links (a elements). Generally this means the links should travel to separate pages, or change content in the case of an AJAX page. Expect some sort of content change when clicking on a nav item.

menu is used for groups of controls (a, input, button). Generally this means the inputs should perform a function within the page. Expect some sort of javascript interaction when clicking on a menu item.

nav: the navigation for the site.

menu: the menu for a web application.

Here's an HTML5Doctor post on nav with a section on how it's different from menu (basically, use it in actual apps). Looks like you want nav.

With the <menu> it's usually used for context menus.

MDN has good documentation on it: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/menu

The best place to get this answer is the HTML 5 standards them self.

Menu is defined in HTML 5.1 2nd Edition.

It, "... represents a group of commands."

Nav is defined in HTML 5.

It is, "... a section of a page that links to other pages or to parts within the page: a section with navigation links."

There are notes for nav that I didn't include but think are important, but I think its best for you to get the definition yourself from the standards.

The definitions marked in this post as the answer are close to correct but have extraneous statements in them that make the answer itself wrong.