Definitions for "Mirror Sites"
Mirror sites are duplicate copies of web sites or web pages. Found on different servers, often the mirror site will lead the visitor to the originating website.
Websites or web pages with the same or similar content as another. They could be used to target near same keywords as the other. As they provide no new and no useful information a Search Engine may penalize a mirror website.
Mirror sites are used to back up a prominent site. This is also used for load balancing at times.