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Unformatted text preview: open 24 hours and allows the customers to do purchases at the time they
wish without leaving the comfort of their homes.
Virus: A computer virus is a piece of code attached to a legitimate program that,
when executed, infects other programs in the system by replicating and attaching
itself to them. In addition to this replicating effect, a virus normally does some
other damage to the system, such as corrupting/erasing files.
Vision input system: An input device that allows a computer to accept input just
by seeing an object. The input data in this case is normally an object's shape and
features in the form of an image. Visualization: Deals with exploring data and information graphically for better
Voice recognition device: An input device that allows a person to input data to a
computer system by speaking to it.
Voice reproduction system: A voice response system that produces audio output
by selecting appropriate audio output from a set of pre-recorded audio responses.
Voice response system: An output device that enables a compute to talk to its
Voiceband: Data communications system that handles moderate volumes of data,
typically from 300 to 9600 bauds. Phone lines that we use to talk to other people is
Volatile storage: A storage medium that loses its contents in the event of power
failure or when power is switched off.
Web client: Any computer on the Internet that can access web servers.
Web page: A hypertext document on the Internet,
Web server: Any computer on the Internet that uses the HTTP protocol.
Wide Area Network (WAN): A computer network which interconnects computers
spread over a large geographical area. It may also enable LANs to communicate
with each other. This type of network may be developed to operate nationwide or
worldwide and the transmission medium used are normally public systems such as
telephone lines, microwave and satellite links.
Wildcard (character): A special character, usually a ? or a *, that is used in
software commands as a generic reference to any character or any combination of
Winchester disk: Medium-sized, non-interchangeable metal disks permanently
housed in sealed, contamination-free containers. Read/write heads are built-in with
Window: A rectangular portion of a computer screen that is dedicated to spec...
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This document was uploaded on 04/07/2014.
- Spring '14