Sections of HTML code in a webpage that search engine spiders scan and analyse to assess the page's relevance for a given query. Originally very important in SEO, meta tags have declined somewhat in SEO importance, with the keywords meta tag being considered virtually redundant. ...
Meta tags are HTML codes that are inserted into the header on a web page, after the title tag. They take a variety of forms and serve a variety of purposes, but in the context of search engine optimization when people refer to meta tags, they are usually referring to the meta description tag and the meta keywords tag.
every page meta tags should be different, because they are the codes for spider and not for human. so write your meta codes according to the content of your site...