Though meta keywords tag and meta description tags are not the main factor search engines consider when ranking sites, they should not be left off the page. A meta description tag is supposed to be a brief and concise summary of your page's content. A meta keyword tag is supposed to be a summary list of the most important words on your page. They were both proposed in order to make using the web easier. Unfortunately, webmasters over the years have abused meta tags so much that search engine creators have had to de-emphasize their importance in their algorithms.