Google hasn’t cared about keywords meta tags for about a decade, says Matt Cutts. It’s easy to understand why. Here’s what he says:
About a decade ago, search engines judged pages only on the content of web pages, not any so-called “off-page” factors such as the links pointing to a web page. In those days, keyword meta tags quickly became an area where someone could stuff often-irrelevant keywords without typical visitors ever seeing those keywords. Because the keywords meta tag was so often abused, many years ago Google began disregarding the keywords meta tag.
I understand Google’s policy, but I’m not sure I agree with their reason for not using the keywords meta tag at all. Still, they have the right to run their algorithms. When it comes to meta tags, Google may not like the keywords tag, but it does like the title and description tags.
You’ll often see where Google has appropriated the description tag of a website and used it for the snippet that appears in the search engine. That’s a good thing. It benefits the site owner, it benefits the visitor, and it benefits Google. But you should be aware that other search engines have their own policies. They’re not all like Google.