Jargon Buster
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H.264
A type of MPEG4 video that is used on Blu-ray discs and recorded by many cameras and camcorders.
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Hacker
Traditionally, a computer expert. More commonly used to mean people who break into others’ computers.
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Hacking
A slang term for illegally accessing computer systems.
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Halftoning
A technique used by laser printers to simulate various shades of colour or grey using dots of ink.
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Handles
In software, small markers that appear around an object on screen. Clicking and dragging the handles will adjust the size of the object.
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Hard disk
A high-capacity disk fitted in almost all PCs and used to store both applications and the documents and files they create.
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Hardware
A physical part of your computer, as opposed to the software programs that run on it.
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HDCP
Copy-protection technology for high-definition content built into Blu-ray players.
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HD DVD
A failed competitor to Blu-ray discs.
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HDMI
High definition media interface. A type of connection that transmits high-definition video and audio signals. It is found on many new TVs, media PCs and high-definition products such as Blu-ray disc players and the Playstation 3 and Xbox 360 games consoles.
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HDTV
High Definition Television. Television broadcast in a widescreen, high-definition format, or a television set that can display high-definition pictures.
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Header
An area that appears at the top of every printed page, normally in a word-processing document.
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Heatsink
A block of metal used to help dissipate the heat from a computer chip.
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Heuristics
A technique used to identify unknown computer viruses based on their behaviour.
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Hibernation
A power-saving standby mode where the computer stores everything from its memory on the hard disk before switching off almost all power.
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High definition
A video file or broadcast with a higher resolution than normal. Generally used to refer to resolutions of 720p, 1080i and 1080p.
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Histogram
An image-editing tool that gives a visual representation of the image’s exposure.
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Home network
Connecting several computers in a home together to share files or internet access.
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Home page
The first page shown when you visit a website. Sometimes also used to mean the page that shows when you open your browser.
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Homeplug
One of the standards for building computer networks using a house’s mains power wires.
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Honeypot
A computer set up specifically to attract spam emails and viruses so they can be tested and examined.
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Hotkey
A key set up to perform a complex action.
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Hot shoe
An adapter found on some cameras that can power a flash, microphone or light.
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Hotspot
A public area covered by a wireless network that allows you to access the internet, either free or for a fee.
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Hot-swappable
Computer accessories or components that can be removed when the PC is running.
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HSDPA
High-speed Download Packet Access. A standard for mobile internet access. HSDPA is a fast type of mobile broadband.
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HTML
Hypertext Markup Language. The language used to write most web pages.
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HTML5
The latest version of the Hypertext Markup Language used to create most web pages. HTML5 includes extra commands that allow for more complex designs.
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Hub
A network device that can link several devices via Ethernet cables.
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Hyperlink
A clickable link that takes you to a new document or web page.
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Hyperthreading
A technology used by some Intel processors. Hyperthreading can accelerate some computing tasks.