HTML 5 New Structure

HTML 5 recognizes that Web pages have a structure, just like books have a structure or other XML documents. In general, Web pages have navigation, body content, and sidebar content plus headers, footers, and other features. And HTML 5 has created tags to support those elements of the page.

• <section> – to define sections of pages
• <header> – defines the header of a page
• <footer> – defines the footer of a page
• <nav> – defines the navigation on a page
• <article> – defines the article or primary content on a page
• <aside> – defines extra content like a sidebar on a page
• <figure> – defines images that annotate an article

source: http://webdesign.about.com