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See also: Replication | Distribution | Distributed file storage

On the Internet 'Mirror' refers to copies of the same location on other web servers in order to help distribute something under stress. This can include the attacks, the Slashdot Effect, litigation, or friendly community support. Files distributed on peer-to-peer networks such as BitTorrent or Kazaa are not considered mirrors.

The term "Mirror" of course comes from the way an image's exact duplicate appears in a reflective surface but a mirror may not contain the exact same file, for which MD5 hashes are sometimes distributed.