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garbage collection
the process by which dynamically allocated storage is reclaimed during the execution of a program
gateway
a device that links two networks in a way that is usually visible to the network users (as opposed to a bridge which is not visible). Gateways may deal with differences of protocol and naming convention when converting between the two networks
geek
although it was originally a derogatory term used for an expert lacking in social skills, it is now used in computing to mean a dedicated expert
general-purpose language
a computer language that can be used to write different types of programs
get listed
to register the Web address of a website on an Internet search engine
ghosted item
a file-backed item that was synchronized without its file stream
gitHub
a Web-based revision control hosting service for software development and code sharing
glitch
an unexpected disturbance in the flow of electricity to a PC, network, or server, most commonly due to a power surge or a dirty connection, can sometimes cause a computer to crash
global positioning system
a system that determines the user’s location by comparing radio signals from several satellites
gnome
a project to build a complete user-friendly Unix-like desktop system based entirely on free software, which is a part of the GNU project and part of the Open Source movement
GNU Compiler Collection
a compiler system produced by the GNU Project supporting various programming languages
Google Doodle
a special, temporary modification of the Google's logo intended to celebrate events, achievements and people
GPU
a specialized electronic circuit designed to rapidly manipulate and alter memory in such a way so as to accelerate the building of images in a frame buffer intended for output to a display
grammar check
software that attempts to correct the grammar of a piece of text, or offer advice on its structure
graphical user interface
a style of interaction between the user and the computer involving a graphics screen, icons, and some form of pointing device such as a mouse. See command line interface and window
graphics card
the equipment inside a computer that creates the image on the screen
graphics tablet
an input device used by designers consisting of a flat, pressure-sensitive pad which the user draws on or points at with a special stylus, to guide a pointer displayed on the screen
graphics
a non-character based method of displaying information on a screen, usually used for displaying pictures, where the basic unit from which the display is built up is the pixel
grayware
a term applied to unwanted applications or files, not classified as malware, but able to worsen the performance of computers and cause security risks
greenfield
a software project developed from scratch rather than built from an existing program, e.g. of developing a system for a totally new environment, without concern for integrating with other systems
grep
a Unix command for searching through one or more text files for a specific text string
grid
used for touch-screen and pen-based computers. Voltage is sent across the glass in horizontal and vertical lines forming it
groupware
software that is designed to help groups of people work together more effectively
hack and slash
video games similar to RPG where the most important things are killing monsters, getting experience and upgrading a character’s skills
hack
to gain unauthorised access to a network system
hacker
a skilled programmer who attempts to gain unauthorised access to a network system
half-duplex
able to transfer data in both directions but only in one direction at a time, i.e. data can be transmitted or received but not at the same time
handheld
a small portable computer that can be held in one hand
handheld scanner
a small handheld scanning device ideal to capture small pictures and logos
handheld
a piece of electronic equipment that is small enough to be used while holding it in your hand
hands-free
used to describe a piece of equipment, especially a phone, that you can use without needing to hold it
handwriting recognition
computer ability to read and interpret handwritten input from sources such as paper, photograps, displays etc; it is highly releated to OCR (optical character recognition) but besides that it also handles formatting, segmentation and sorting for the best results
hard disk
a common magnetic storage device that reads and writes data on a metal disks inside a sealed case
hard error
an error occurrence in a computer system that is caused by the failure of a memory chip
hardware
the physical components of a computer system
hashtag
a word with the symbol # in front of it, used especially in social media and microblogging to identity or search for subjects of interest, e.g. #love #cookie #selfie
head
the part of hard disk that reads and writes data on disk
header
the first section of a message that contains information about the content and transmission of the message including the sending and destination addresses
headphones
sound output device that fits over the ear of the user
heat sink
a passive heat exchanger component that cools a device by dissipating heat into the surrounding air
help-desk
a telephone service for helping users solve problems that occur on computer systems
hexadecimal
positional numeral system with a radix, or base, of 16
HFS
a proprietary file system developed by Apple Inc
Higher National Diploma
a British college qualification that usually requires a period of full-time study, more advanced than an HNC and not as advanced as a degree
high-level language
a programming language closer to human language than low-level computer languages such as machine code or assembly language
high-level program
a computer program written using a high-level language
highlight
to select by marking on the display screen
hijacking
a computer crime that involves redirecting anyone trying to visit a certain website elsewhere
hologram
a three-dimensional image reproduced from a pattern of interference produced by a split coherent beam of radiation (such as a laser)
homepage
the main start page of a website
host
a computer that provides a service on a network or a program that carries a virus
hotspot
the location of a wireless access point, often found in public places such us airports, stations and hotels to provide a connection to the internet
hover
to hold a cursor over an icon for a short period of time
hub
an electronic device at the center of a star network topology; a common connection point for devices on a network
hybrid cloud storage
a combination of public cloud storage and private cloud storage where some critical data resides in the enterprise's private cloud while other data is stored and accessible from a public cloud storage provider
hybrid database
a relational database system that supports both in-memory and on-disk storage
hybrid encryption
a method of encryption that combines two or more encryption schemes and includes a combination of symmetric and asymmetric encryption to take advantage of the strengths of each type of encryption
Hybrid hard drive
a type of large-buffer computer hard disk drive, different from standard hard drives, as it integrates the cache using non-volatile memory or even a small Solid-state drive (SSD)
hyperlink
a text or image in a webpage that causes a related webpage to be displayed or another program to be started when the user clicks on it
hypermedia
a combination of videos, images, sounds, text, etc connected together on a website, which you can click on in order to use them or to go to other related videos, websites
hypertext markup language
a page description language that has a set of tags that can be inserted into a document to make it act as a webpage; the tags determine how the document is displayed on the screen and marks the position of hyperlinks
hypertext transfer protocol
application protocol for distributed, collaborative, hypermedia information systems, it is the foundation of data communication for the World Wide Web