Meta tags include title, description and keywords tags, we need to check on all the web pages whether the Meta tags are present or not and if not search engines cannot understand the purpose of the web pages.
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.
Meta tags such as description, title, robot are very helpful for search engines. Meta title provides information what the page is about. Meta description provides the summary of the page. Meta robot is helpful to index/noindex & follow/nofollow the page by search engine. However meta keywords are no more useful for both visitors and search engines.