Isp:Internet service provider
Registrar: an official recorder or keeper of record
Backbone:something that resembles a backbone
Router:a device that mediates the transmission routes of data packets over an electronic communications network (as the Internet)
Computer:a programmable usually electronic device that can store, retrieve, and process data
Url:the address of a resource (as a document or Web site) on the Internet that consists of a communications protocol followed by the name or address of a computer on the network
WWW:It’s a abbreviation
Ip address:is the numeric address of a computer on the Internet