Description meta tags are important because Google might use them as
snippets for your pages. Note that we say "might" because Google may
choose to use a relevant section of your page's visible text if it does a
good job of matching up with a user's query. Alternatively, Google
might use your site's description in the Open Directory Project if your
site is listed there (learn how to prevent search engines from
displaying ODP data). Adding description meta tags to each of your pages
is always a good practice in case Google cannot find a good selection
of text to use in the snippet. The Webmaster Central Blog has an
informative post on improving snippets with better description meta
tags.
Words in the snippet are bolded when they appear in the user's query (2). This gives the user clues about whether the content on the page matches with what he or she is looking for. (3) is another example, this time showing a snippet from a description meta tag on a deeper page (which ideally has its own unique description meta tag) containing an article.
(3) A user performs the query [rarest baseball cards]. One of our deeper pages, with its unique description meta tag used as the snippet, appears as a result.
Words in the snippet are bolded when they appear in the user's query (2). This gives the user clues about whether the content on the page matches with what he or she is looking for. (3) is another example, this time showing a snippet from a description meta tag on a deeper page (which ideally has its own unique description meta tag) containing an article.
(3) A user performs the query [rarest baseball cards]. One of our deeper pages, with its unique description meta tag used as the snippet, appears as a result.
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