Improve search engine positioning and ranking. Most sites are missing proper Meta tag placement.
Meta tags are crucial.
A meta tag, for our purposes, is a way of providing a description and keywords that are only visible to the robots from the search engines. However, there is debate over how much weight these are given. Thus, metadata is a definition or description of data and metalanguage is a definition or description of language. A search engine grades your individual web pages. Each search engine is a little differen't in the manner in which it bases your grade.