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Description META tag:
In
past this tag was used to specify
text that would appear in search engine results alongside
link to your site. Keywords could be placed into this text to influence ranking. However it was abused similar to
Keywords META tag and has befallen
same fate, meaning it is not as useful as it once was. Some search engines do not display it in their results (most notably Google, which retrieves
text from content on your page) and do not use it to rank a site. Having said that some search engines do still use it so again it is a mistake to ignore it completely.
Descriptions placed into this tag should, strangely enough, be very descriptive of
page or site they reside in. Include a few relevant keywords/keyphrases that you are optimizing for in
description and try to limit its length to 25-30 words. Also try to use no more than two sentences.
Summary:
Although not as important as they once where,
META tags can still influence a search engine when it comes to deciding whether your web page is relevant or not.
Keywords META tag:
15-20 keywords, include misspellings of keywords/keyphrases
Description META tag:
Include keywords/keyphrases, 25-30 words, no more than two sentences.

Frank Kilkelly is a Search Engine Optimization (SEO) Expert and Webmaster at http://www.seo-ireland.com/, a complete search engine optimization resource. The highlight of the site is an SEO forum for discussion of the latest techniques and tips to improve the ranking of your web site.