GCSE Computer Science Key words D-H
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- Created by: DSD
- Created on: 29-12-17 21:29
Database
A collection of data records (made up of fields) often represented as tables.
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Data type
Tells you what kind of data it is, e.g. integer, real, string, etc.
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Debugging
Identifying and fixing errors in a program.
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Decomposition
Breaking a problem down into smaller problems.
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Dedicated system
A computer system designed to carry out a specific task.
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Defensive design
A method of designing a program so that it functions properly and doesn’t crash.
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Defragmentation
Reorganising data on a hard drive to put broken up files back together and collect up the free space.
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Denary
A number system using base—10. Also known as decimal.
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Denial-of—service attack
A network attack which stops users from accessing a part of a network or website.
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Device driver
A piece of software that allows applications to communicate with a piece of hardware.
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Digital divide
The inequality created by the fact that some people have greater access to technology than others.
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Digital signal
The representation of an analogue signal using binary data.
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Disk management
Organisation and maintenance of the hard disk.
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Domain name server (DNS)
A server which stores website domain names and their IP addresses.
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Dongle
A small piece of hardware which allow devices to connect to a network wirelessly.
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DO UNTIL loop
Type of iteration statement.
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D0 WHILE loop
Type of iteration statement.
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Dynamic IP address
An IP address which is automatically assigned to a device when it connects to a network.
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Embedded system
A computer built into another device, e.g. a SmartTV.
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Encryption
Coding (’encrypting’) data so that it can only be decoded (’decrypted’) with the correct key.
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Environmental issue
An issue relating to how we impact the natural world.
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Erroneous data
Test data that a program isn’t designed to accept.
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Error diagnostics
Information about an error once it’s been detected.
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Ethernet
Network protocol used on LANs.
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Ethical issue
Something which raises questions of right and wrong.
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E-waste
Discarded computer material.
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Extended ASCII
An 8-bit character set consisting of 256 characters.
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Extreme data
Test data on the boundary of what the program will accept.
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Fetch-decode-execute cycle
The process that the CPU uses to retrieve and execute instructions.
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Fibre optic cable
A high performance cable that uses light to carry data.
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Field
An element of a record used to store one piece of data. A column of a database table.
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File handling (programming)
Reading from and writing to external files.
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File management
The organisation, movement and deletion of files.
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File sharing
Copying files between devices on a network.
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Fnal testing
When the testing stage of the software development cycle is only done once to check the software meets all the initial requirements.
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Firmware
Permanent software stored on ROM, used to control hardware or embedded systems.
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Flash memory
Solid state non-volatile data storage.
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Flow diagram
A graphical way of showing an algorithm.
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FOR loop
A type of count-controlled iteration statement.
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Frame
The unit used to send data via Ethernet over a LAN.
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FTP (File Transfer Protocol)
A protocol used to access, edit and move files on another device, like a server.
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Functionality testing
A type of testing that assesses how well a program meets the requirements.
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Function
A sub program that takes parameters and returns a value.
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Gigabyte
1000 megabytes.
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Global divide
The digital divide between different countries.
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Global variable (programming)
A variable available throughout the whole program.
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GPU (Graphics Processing Unit)
A circuit for handling the processing of graphics and images.
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Graphical user interface (GUI)
Allows the user to interact with the computer in a visual and intuitive way.
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Graphics card
A piece of hardware containing a CPU.
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GUI builder
An IDE tool for giving a program a graphical user interface.
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Hacker
A person who tries to illegally access or attack a computer network or device.
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Hard disk drive (HDD)
Traditional internal storage for PCs and laptops that stores data magnetically.
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Hardware
The physical parts of a computer system.
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Heat sink
Pulls heat away from the CPU to help maintain its temperature.
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Hexadecimal
A counting system using base-16 consisting of the digits 0's and the letters A-F.
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High-level language
A programming language like C++ , Java and Python that is easy for humans to understand.
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Hosting (Internet)
When a business uses its servers to store the files of another organisation.
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Hotspot
A location where people can access a wireless access point.
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HTTP (Hyper Text Transfer Protocol)
Used by web browsers to access websites and communicate with web servers.
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Other cards in this set
Card 2
Front
Tells you what kind of data it is, e.g. integer, real, string, etc.
Back
Data type
Card 3
Front
Identifying and fixing errors in a program.
Back
Card 4
Front
Breaking a problem down into smaller problems.
Back
Card 5
Front
A computer system designed to carry out a specific task.
Back
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