A computer virus is a malicious software program that is typically transmitted via the Internet or a network. It can damage or destroy an infected computer or network. The virus usually attaches itself to another program or document to gain entry and can replicate itself. Anti-virus software is available to protect against viruses. It is a form of malware (from the words "malicious" and "software"). Other forms of malware include worms, Trojan Horses, zombies and spyware.
A false warning about a computer virus, worm or other malicious software program. Typically transmitted en masse via email or computer network. These warnings are usually forwarded using large distribution lists, and they will typically suggest that the recipient forward the warning to other distribution lists. If you get a warning message about a new virus, you can check it out by visiting one of several web sites that keep up with viruses and virus hoaxes such as http://www.us-cert.gov.
A VPN uses a public network (usually the Internet) to connect remote sites or users together. The VPN uses "virtual" connections routed through the Internet from the business's private network to the remote site or employee.