Title metatags are used by all search engines and, in most cases, are heavily weighted when determining the relevancy of a document in a search. Accurate and unique title tags lead to better search results. Better search results mean a better user experience. Also, many search engines use the title as the displayed link (as opposed to the URL). Duplicate titles can have a major impact on a web page’s search ranking and appearance in the search results list, and can lead to confusing results.
Author metatags are used to identify who created the web page. This information can be useful in determining the individual responsible for correcting any errors on the web page.
Description metadata is an important source of information for both a search engine index and how a page is described in the search results. The indexed information for a web page determines the page’s relevance to specific search terms, which in turn determine where the page is presented in the search results. In addition to a high ranking, it is critical to have a clear description of what the web page contains. Without a description tag the web page owner has no control over the description that a search engine user is presented with by the search engine.
Keyword metadata is an important source of information for a search engine index. The indexed information for a web page determines the relevance of a page to specific search terms, which in turn determine where the page is presented in the search results.
All metadata elements, and the corresponding values, used on the web page are listed. You can review this list to ensure that any tagging standards are adhered to.