Every page in your website should have a title tag that describes what the content contains. It's also the first content a search engine robot looks for. Your relevancy in some search engines depends on how wisely you construct your title tag. Meta tags containing keywords, keyphrases, description, robot instructions, etc. should go directly underneath your title tag. They must be in the HEAD element.
Meta tags are instructions designed specifically for browsers and search engines.
Others describe the web page. Others contain keywords and keyphrase. Tips For Better Search Engine Rank 1. Your domain contains your top keywords. Your title tag contains your top keywords.