A collection of several different data repositories that looks like a single database to the user. A prime example in the Internet is the Domain Name System. It can be used in the Administrative Domain context, or the Domain Name context. The DNS is a general purpose distributed, replicated, data query service. The principal use is the lookup of host IP addresses based on host names.
Most countries also have a domain.
It is defined in STD 13, RFCs 1034 and 1035. DS1 A framing specification for T-1 synchronous lines. T1 DS3 A framing specification for T-3 synchronous lines. A pan-European backbone service. A foundation established to address social and legal issues arising from the impact on society of the increasingly pervasive use of computers as a means of communication and information distribution.