extranet – An intranet that is accessible to those not part of the organization by special permission. See intranet.
File Transfer Protocol (FTP) – An instruction set that specifies how files are downloaded or uploaded. See download, upload.
floppy – Informal term for diskette. Also known as 3.5" floppy. See diskette.
FTP – See File Transfer Protocol.
full duplex – See duplex.
gamepad – A device that permits more realistic game play than is possible with a mouse or touchpad.
gameport – See MIDI/Gameport.
GB – See gigabyte.
gigabyte (GB) – a unit of measurement used to describe data quantity. One GB is equal to approximately one billion bytes. See byte.
graphical user interface (GUI)
GUI – See graphical user interface.
half duplex – Describes a communication channel that is only open in a single direction at any given time. In telecommunications, it refers to the ability of only one party to transmit data at any given time. Contrast duplex.
hard disk – An internal data storage device made of hard aluminum disks coated with iron oxide.
hard drive – A device that enables a computer to read data from and write data to a hard disk.
hardware – The physical components of a computer.
hertz (Hz) – a unit of measurement used to describe frequency rate. One hertz is equal to one cycle per second. See megahertz, microprocessor, refresh rate.