D-Link DFL-500 User Manual page 108

VPN, Virtual Private Network : A network that links private networks over the Internet. VPNs use encryption
and other security mechanisms to ensure that only authorized users can access the network and that the data
cannot be intercepted.
Virus : A computer program that attaches itself to other programs, spreading itself through computers or
networks by this mechanism usually with harmful intent.
Worm : A program or algorithm that replicates itself over a computer network, usually through email, and
performs malicious actions, such as using up the computer's resources and possibly shutting the system
down.
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