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 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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