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Asymmetric Digital Subscriber Line, a technology that allows high speed use of the Internet down normal telephone wire; however it works satisfactorily only within relatively short distances from an exchange.

Put simply this is the rate at which information that can travel along a given communications link, for instance down the medium (twisted copper pair, cable, wireless frequency etc) used to connect to the Internet. See Mbps, Gbps, Tbps.

A generic name for methods of delivering electronic data which are fast enough (have enough bandwidth/have large anough pipes) to be used to deliver motion-picture quality images. Cable can deliver broadband; telephone lines cannot (at present).

A program used by the FBI in the US which can 'sniff-out' suspicious content in protected messages and data-bases and take copies; may eventually be judged unconstitutional in its present form.

Authentication that a signature or document or transaction on the Internet is what it says it is; certification is supplied by Trusted Third Parties or Certification Authorities who use advanced security features to ensure that data accompanied by a Certificate cannot be tampered with.

Controlled Foreign Corporation; most high-tax countries have legislation which compels the repatriation (or equivalent taxation) of the profits of companies in offshore jurisdictions if they are substantially owned by shareholders in the high-tax jurisdiction.

Catalogue Interchange Format.

Placing a virtual server, dedicated to one client (one customer-base), on the same server as is used by the ISP or Internet host who is providing that client with Internet access.

Electronic money, provided in a secure way by a bank to a customer, which can then be used electronically to buy products or services.