Meta Tags are very important for the Site .This is an often disputed topic among SEO’s because some feel search engines to not use these when determining search engine relevancy while others do. My take on this is that most search engines don’t use them when determining search results. The meta description is located in the head of your site along with the title.
For all practical purposes, "most" search engines is just Google and Bing. They don't take any note of Meta Keywords. The role of Meta Description is to write an advertisement that compels the searcher to click the result in a SERP. Its wording need not be keyword rich, but you will use those words in a typical example because the page content has those words. Each click in a SERP is counted towards a future ranking change, among many other factors. So, there is an indirect value in the Meta Description.