# HTML Sections & Outlines
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* defines a section that contains navigation links that appear often on a site.
* You can have primary and secondary menus, but you never nest, or put a ``element inside a `` element.
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* defines a piece of self-contained content.
* It does not refer to the main content alone and can be used for comments and widgets.
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* defines a section of a document to indicate a related grouping of semantic meaning.
* Utilize the section element providing extra context from the parent element makes sense.
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* defines a section that, though related to the main element, doesn't belong to the main flow, like an explanation box or an advertisement.
* It has its own outline, but doesn't belong to the main one.
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* defines a page which typically contains the logo, title, and navigation.
* The header can also be used in other semantic elements such as ``or `` — or section header, containing perhaps the section's heading, author name, etc. ``, ``, ``, and `` can have their own ``.
* Despite its name, it is not necessarily positioned at the beginning of the page or section.
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* defines a page footer which typically contains the copyright, legal notices and sometimes some links — or section footer, containing perhaps the section's publication date, license information, etc. ``, ``, ``, and `` can have their own ``.
* Despite its name, it is not necessarily positioned at the end of the page or section.
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