Meta Tags for Keywords, Description and Robots
Meta Tags mainly consists of three parts - Keywords, Description and Robots. The meta tags will be used by the search engine spiders to gather data about your site.
You should insert the meta tag element at the top of your document, just after the
Meta Keywords is used to tell about your Site Keywords.
Meta Description is used to give information about your Site.
Meta Robots is used to give special commands to the Crawlers.