Google does not use the keywords meta tag in web ranking

If you have been a SEO or have at-least been doing some SEO for your website or blog for a long time you might already know that Google ignores meta keywords.

The Google Webmaster blog today made a official announcement stating that they do not consider meta keywords, doing away with a very old SEO myth that keywords can help you gain more traffic...

This is done for obvious reasons as many SEO consultants started spamming search engines by adding spam keywords to webpages. If you have been thinking that adding keywords is going to help you, you know now that is practically useless.
Watch a video where Google webspam head talks about the meta keywords and why Google does not consider them.