The glossary below contains many of the terms you will find in common use throughout our website. Please refer to this list to find definitions of terms and answers to other Internet security-related questions.


A group of computers and associated devices that are connected by communications facilities (both hardware and software) for the purpose of sharing information and peripheral devices such as printers and modems. See also LAN (local area network).

Two or more computers connected together so that they can share resources.