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.


The simultaneous delivery of a file to a number of computers. Multicasting reduces load on a network by sending one file to multiple client computers.

To simultaneously send the same message to a list of recipients on a network.

Sending a message simultaneously to more than one destination on a network. See also broadcast, unicast.