<header> represents the title page of a content block or the entire page.
<section> a content block on the page, such as chapters elsewhere headers, footers, or page, and can h1, h2 ...... elements in combination, represent document structure.
<article> represents an independent content pages are not relevant to the context of such an article.
<aside> represents <article>, and <article> tag associated auxiliary information other than the contents of the label content.
<hgroup> represents a title of the contents of the entire page or block in combination.
<figure> represents a separate piece of streaming content, generally designated streaming content in the document body a separate unit.
<figcaption> Defines the title <figure> tag.
<nav> represents a section of navigation links page.
<footer> represents the entire page or a page footer in a content block. In general, it will contain the name of the creator, creation date and contact information.