isr.co.ro : glossary Mirror An Internet site that duplicates a collection of programs, documents, or other resources that are organized and maintained on a "home" site. Mirroring is done to provide additional access lines, greater hours of availability, or closer connections for heavily used sites. Most mirrors duplicate either popular File Transfer Protocol (FTP) archive sites, such as SimTel or InfoMac, or commercial software sites, such as the Netscape Communications software download server.