Vaccine: A computer program that stops the spread of a virus, also called an antivirus.
Vacuum tub: An electronic tube used as a basic component in the first generation of computers.
Video conferencing: Computer conferencing combined with cameras and wall-size screens.
Virus: A set of illicit instructions that passes itself on to other programs with which it comes into contact.
Voice mail: A system in which a spoken message is digitized and stored in the recipients voice mailbox. Later the recipient can dial the mailbox, and the system delivers the message in audio form.
Volatile: Subject to loss when electricity is interrupted or turned off. Data in semiconductor storage is volatile.
Variable: Values of the variable can be change during program execution.