Sectioning is a new semantic markup to define sections on the page. It is mainly used as future expansion of HTML5 webpage and designed to target search engine understanding of your page content. This content type was based on extensive collection of div attributes and modeled after most common div attributes.
List of sectioning content types:
Header – contains header context
Footer – contains footer context
Section – specifies certain section of the page
Article – article content on the page
Aside – related content to main content on the page
Nav – content that construct navigation on the page
All of these sectioning elements can be styled with the help of CSS.