Meta Description Keyword Density — This is a measurement of the keyword density of your site’s applicable meta keyword description meta tag keywords.
Meta Description Word Count — This is a measurement of the number of words in your site’s meta description tag.
Meta Keywords Keyword Density — This is a measurement of the keyword density of your site’s applicable meta tag keywords.
Meta Keywords Word Count — This is a measurement of the number of words in your site’s meta keywords tag.
Meta Tags – Meta tags are non displayed text written in HTML intended to describe your Web page for the purpose of cataloging the content of your Web page.
Meta Search Engine – A website that takes your search query and passes it on to several different search engines and directories, then summarizes the results in a logical manner for you to review.
Mirror Site – A Web site that is a replica of an already existing site, used to reduce network traffic (hits on a server) or improve the availability of the original site. Mirror sites are useful when the original site generates too much traffic for a single server to support. Mirror sites also increase the speed with which files or Web sites can be accessed: users can download files more quickly from a server that is geographically closer to them. For example, if a busy New York-based Web site sets up a mirror site in England, users in Europe can access the mirror site faster than the original site in New York. Sites such as Netscape that offer copies or updates of popular software often set up mirror sites to handle the large demand that a single site may not be able to handle.
Mirror Sites – Identical, but separate websites on different domains. They are commonly used legitimately by large websites to share heavy server loads, and by search engine spammers to generate more search engine referrals and revenue.
In general, the search engines frown upon mirror sites and do not hesitate to assess duplicate content penalties when they feel they are warranted.