Meta Tag Usage And Types

Robots meta tag

Controls Web robots on a per-page basis.
Robots may traverse this page but not index it.

Keywords meta tag

Keywords used by search engines to index your document in addition to words from the title and document body.

Description meta tag

A short, plain language description of the document. Used by search engines to describe your document. Particularly important if your document has very little text, is a frameset, or has extensive scripts at the top.

Pragma meta tag

Controls caching in HTTP/1.0. Value must be "no-cache". Issued by browsers during a Reload request, and in a document prevents Netscape Navigator caching a page locally.

Refresh meta tag

Specifies a delay in seconds before the browser automatically reloads the document. Optionally, specifies an alternative URL to load.

Author meta tag

Typically the unqualified author's name.

Copyright meta tag

Typically an unqualified copyright statement.

Revisit After meta tag

This tag tells search enignes how often to stop back and how often you update your content.
This is somewhat outdated by the new XML google sitemaps.