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cache coherency
a system that ensures that any changes written to main memory are reflected within the cache and vice versa
cache controller
the set of electronic logic circuits that control the operation of cache memory
cache hit
the process of successfully finding the required data stored in cache memory
cache
a hardware or software component that stores data so future requests for that data can be served faster
CAD
a computer technology that designs a product and documents the design’s process
call centre
a large office in which a company’s employees provide information to its customers, or sell or advertise its goods or services by telephone
callback system
a system that automatically disconnects a telephone line after receiving a call and then dials the telephone number of the system that made the call to reconnect the line
CAM
the use of computers to control production processes, in particular, the control of machine tools and robots in factories
Caps Lock key
a key on a computer keyboard that you press to make any letters you type appear as capital letters until you press it again
captive portal
a webpage that a user must view and interact with before being given access to a public network, it is mainly used for authentication and is usually in place for free WiFi hot spots
careware
software licensed in a way that benefits a charity, for example Vim or Arachnophilia
cascade
a command in some applications automatically organizing all the windows on the screen in a tidy stack, making them all the same size, and placing them “on top” of one another but slightly offset so you can see the title bar of every window; this is in contrast to the Tile command, which divides up the screen equally between all the windows, arranging them so they’re touching each other on all four sides
cathode ray tube
a display device that uses an electron gun to fire a beam of electrons at a phosphor-coated screen
cell
an area in a spreadsheet which contains data
cellphone
a mobile telephone that communicates with a local transmitter located within a small geographic area called a cell
cellular network
a radio communications systems that divides a region into cells so that each region becomes a network with every point connected to a local transmitter within the cell
central processing unit
the electronic processor at the centre of a computer
CGA
first colour display system for IBM PCs and compatible machines, it was superseded by EGA,VGA,SVGA,XGA
channel
a path for the transmission of data
chat room
a virtual space on a website where online discussions organised around specific interests are held in real-time by users typing text messages
check data
information written to disks in a RAID system which is used to restore data if one of the array drives fail
checkbox
element of options in a dialog box, i.e the user can select several options from the ones given
checksum
a calculated value that is stored with data to detect any errors that may occur when the data is copied or transmitted
chip
an electronic integrated circuit in a small package
chipset
a number of integrated circuits designed to perform one or more related functions
circuit board
a board containing integrated circuits which make up the processor, memory, and electronic controls for the peripheral equipment of computers
circuit
a combination of electrical devices and conductors that form a conducting path
class
the term used for a collection of objects in object oriented programming
cleanse
a term used in data mining meaning to remove duplicate information and erroneous data
clear
standard Unix computer operating system command which is used to clear the screen
client
a network computer used for accessing a service on a server
client-server application
a program that is accessed from a client computer but most of the processing is carried out on a server computer
client-side program
on the internet, a program that is run on a client computer rather than on a server computer
clipart
professionally-prepared graphical images stored on a computer system
clipboard
the section of memory that temporarily stores data while it is being copied and pasted
cloaking
a search engine optimization (SEO) technique in which the content presented to the search engine spider is different from that presented to the user’s browser
clock
the set of electronic circuits used to control the timing of signals and synchronise different parts of a computer system
clock cycle
the time between two adjacent pulses of the oscillator that sets the tempo of the computer processor
cloud drive
a Web-based service that offers storage space on a remote server, it is usually accessed over the Internet using client-side software, and is used to back up files
cluster controller
a device that controls a number of similar peripheral devices such as terminals and links them up to the main computer
cluster
a term used in data mining meaning a group of data that has similar features or is based on a limited data range
clustering
a method used in data mining that divides data into groups based on similar features or limited data ranges
CMYK
subtractive color model, used in color printing, or to describe the printing process itself, it refers to the four inks used in color printing
coax
a type of cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield, it usually also has an insulating outer sheath or jacket
codec
a program used for converting sound and video signals for use in a computer
cold-boot
load the operating system of a computer from 'cold'
COM program
a DOS program with a .com filename extension that loads and runs in 64 kilobytes or less of memory
command interpreter
the part of an operating system that processes commands (either program instructions or typed using a keyboard)
command line interface
a method of interaction with a computer whereby the user types specific commands in order to archive his requirements, generally regarded as not very user-friendly, although it is often the most efficient way of communicating with the computer
command-based
a computer system which interacts with the user by commands entered at a prompt on the screen
comment
part of a program text included for the benefit of the human reader and ignored by the compiler
commodore 64
the model name of one of the first popular personal computers to be made available in the United Kingdom, which had a very good graphics system and was particulary suited to running computer games programs
compatible
able to operate on the same type of system or run the same software
compile
to convert a program written in a high-level language into machine code using a compiler
compiler
a program that converts the whole of a program into machine code before the program is used
compound document
an electronic document which may contain text, photographs, spreadsheets, audio or graphic
compress
to reduce to a much smaller size
compression
the process used for reducing a file to a much smaller size
computer centre
a place where there is a central computer facility usually containing mainframes
computer consultant
a person who is paid to advise on computing system issues
computer engineer
a person who designs and develops computer systems
computer game
an interactive game played against a computer
computer lab
a room full of computers used for study
computer language
a language used for writing computer programs
computer operator
a person whose job is to operate part of a computer system
computer salesperson
a person whose job it is to sell computers
computer science
the study of computers and their use
computer
a general purpose machine that can be programmed to process data in a variety of ways
computerized
changed so that it can be operated or controlled using a computer
computing support officer
a person whose job it is to provide support to computer users including setting up, maintaining and troubleshooting computer systems and giving technical advice
computing support
a field of work that provides a service including setting up, maintaining and troubleshooting computing systems and providing technical advice to users
computing
the theory and practice of computers
concatenate
link together in a chain of series
conceptual schema
the logical design of a database
concurrent versions system
a cross-platform code management system originally based on RCS
conference
a computer-based system enabling users to participate in a joint activity despite being separated in space or time
configuration
the particular hardware elements and how they are interconnected in a computer system or network
configuration file
a file that contains settings information for a particular program; when the program is executed, it consults the file to see what parameters are in effect
configure
to adjust the settings
connectivity
the characteristic of being connected
constructor
in object-oriented programming, a special type of subroutine called to create an object, prepares the new object for use
consultant
a (computer) expert brought in to give advice
content farm
a website whose content is written for search engine bots instead of human readers; topics on the website are chosen specifically for their ability to rank highly in search engine results
control bit
a data bit used to mark parts of a transmitted signal so that the transmission can be controlled, e.g a start bit marks the beginning of a character and a stop bit marks its end
control bus
the set of conductors that carry the control signals between the Control Unit and other parts of a computer
control panel
a utility that lets you configure and adjust a system
cookie
a piece of data stored by a website within a browser, and then subsequently sent back to the same website by the browser
corrupt
to damage in such a way that prevents normal use
counter
a component of the control unit which selects instructions one at a time from memory
cp
a Unix command for copying a file
CPU socket
a mechanical component that provides mechanical and electrical connections between a microprocessor and a printed circuit board (PCB)
crack
to break into a computer system in order to steal information or cause damage
crackers
computer criminals who use technology to perform a variety of crimes: virus propagation, fraud, intellectual property theft, etc.
crapware
software bundled with a new PC or other software package that the user is not fully aware that they are installing, usually consists of poor quality utilities, games, toolbars and other useless software
crash
to fail suddenly and completely usually referring to the failure of a hard disk
crashed disk rescuer
one of small programs included with an OS that improve the systems perfomance, used to restore disks and corrupted files
credential stuffing
the term related to a specific type of hacking that secures a user's credentials by breaching a system, and then attempts to use these credentials with other systems
crossfire
the technology that allows up to four GPUs to be used in a single computer to improve graphics performance
Cascading Style Sheets
a technique used to define text styles, table sizes, and other aspects of web pages and apps
cursor keys
arrow keys which move the insertion point, and keys such as Home, End, Page Up and Page Down, which let you move around documents
cursor
a symbol on the monitor screen that indicates the point on the screen that is being used
cut and paste
to remove some data from a file and temporarily store it in the computers memory then insert a copy of the data in another position in the same or in another file
cybercrime
a crime conducted via the Internet or some other computer network
cybernetics
the study of control and communication in animals and machines, used in the design of robots
cyberslacking
a term used to describe the increased use of the internet on company computers by employees for their personal use or entertainment
cyberspace
the combination of all the data on all the computer networks throughout the world accessed using the Internet
cyberstalking
criminal practice where an individual uses the Internet to systematically harass or threaten someone