Meta Tag Information
Meta tags can be used to specify to search engines how you want your document
to be indexed. It contains valuable information for search robots to use
in adding your pages to their search indexes. In the absence of any other
information, some search engines will index all words in your document (except
for comments), and will use the first few words (e.g. 250 characters) as a
short abstract to serve back. But meta tags can be used to specify
additional keywords and a short description, which can be used to index the web
page and therefore control the indexing of the web site.
Common Types of meta tags
Keywords are used by search engines to make the page more easily searchable. You would put words that are used on the page that best describe the page.
There is also a meta tag that provides a slightly different function. These types of meta tags actually tell the Web server or browser to do something with or to the page. The most common of this type of meta tag is the Refresh tag. It is used to either refresh the current page or move the browser focus to an entirely new page.