TYPE OF META TAGS:
META TITLE TAG: Meta title tags are the most important of all of the Meta tags discussed here. Title tags have a real impact on search rankings and, perhaps just as importantly. Meta title minimum limits should be 50 characters and maximum should be 70 characters.
META DESCRIPTION TAG: These Meta description tags use in Meta tags, it explains to search engines and searchers themselves what your page is about. Meta description limits should be 135 characters.
META KEYWORDS TAG: These also keywords tags use in Meta tags, add keywords related websites or content in these tags.
Meta tags are most important factors for websites ranking in search engines.