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


A communication medium for transferring information. Also called a line or circuit. Depending on its type, a communications channel can carry information in analog or digital form. A communications channel can be a physical link, such as a cable that connects two stations in a network, or it can consist of some electromagnetic transmission.