In computing, a zombie is a malicious software program that is typically transmitted via the Internet or a network. A zombie can install itself on a PC and remain dormant until an external event triggers it. It can damage your PC, steal your personal information and send it to an unauthorized email account, or even open up remote control access to your PC. It usually attaches itself to another program or an email to gain entry. Software is available to protect against zombies. The zombie is a form of malware (from the words "malicious" and "software"). Other forms of malware include viruses, worms, Trojan Horses and spyware.