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.

DNS Domain Name System

A system that converts host names and domain names into IP addresses on the Internet or on the local networks that use the TCP/IP protocol. For example, when a Web site address is given to DNS, DNS servers return the IP address of the server that is associated with that name.

A hierarchical system of host naming that groups TCP/IP hosts into categories. For example, in the Internet naming scheme, names with .com extensions identify hosts in commercial businesses.

Translates the domain names to IP addresses. It also associates information with domain names and lists the mail exchange servers accepting email for each domain.