Here is the list of some of the new tags introduced in HTML5
<section>
A section is a thematic grouping of content, typically preceded by header, possibly with a footer after. sections can be nested inside of each other, if needed, and can hold any amount of typical markup.
<header>
The header of a section, typically a headline or grouping of headlines, but may also contain supplemental information about the section.
<footer>
A footer typically contains information about its section such as who wrote it, links to related documents, copyright data, and the like.
<nav>
Defines the navigation area, typically a list of links. The nav should be a sibling of the main section, header, and footer.
<article>
An independent entry in a blog, magazine, compendium, and so on.
<aside>
An aside indicates content that is tangentially related to the content around it.
<audio>
Defines sound, like music or audio streams
<video>
Defines video, like video clip or streaming video