HTML - Meta Tags and Meta Data

Meta tags are used to supply information for search engines that will not be seen by the web surfer. These invisible units provide a flag for search engines to investigate and will then present that data to any potential users that stumble across your site through a search engine.

In the past, meta tags were the primary means for your site to be recognized by web spiders, but webmasters abused meta tags to improve their rankings in search engines. As a result, search engines have since modified their approach to keep results accurate. They now rely less on meta tags. Nevertheless, you should still include meta for those search bots that still do recognize them.