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Hacker is a term used by some to mean "a clever programmer" and by others, especially those in popular media, to mean "someone who tries to break into computer systems."


A computerized device designed to be carried around in the hand for mobile use. Also sometimes known as a PDA (Personal Digital Assistant)


An electronic pointer to the audio on an audio CD.

Hard Disk

A hard disk is part of a unit, often called a "disk drive," "hard drive," or "hard disk drive," that stores and provides relatively quick access to large amounts of data on an electromagnetically charged surface or set of surfaces.


In information technology, hardware is the physical aspect of computers, telecommunications, and other devices.


HD TV is a term used to describe high definition television formats. These include the NTSC format in 16:9 with 853 x 480 resolution and PALplus with 1,024 x 576 resolution.

The implementation of HD TV is being carried out with the term HD-ready. HD-Ready was used to describe the first generation of HD television devices, which were offered to consumers in 1,280 x 720 resolution. The technical description for this format is HDTV 720p.

The HDTV 1080p format has the highest resolution and is referred to as full-HD. This format is broadcast in 1,920 x 1,080 resolution.

Helper Application

In web terms: A program helping the browser to display, view, or work with files that the browser cannot handle itself.


Hertz is a unit of frequency (of change in state or cycle in a sound wave, alternating current, or other cyclical waveform) of one cycle per second.


The number of times a web object (page or picture) has been viewed or downloaded.

Home Page

  • For a Web user, the home page is the first Web page that is displayed after starting a Web browser
  • For a Web site developer, a home page is the first page presented when a user selects a site or presence on the World Wide Web.



Hypertext Markup Language
HTML is the set of markup symbols or codes inserted in a file intended for display on a World Wide Web browser page. The markup tells the Web browser how to display a Web page's words and images for the user.

HTML Document

A document written in HTML.


HTML Document Object Model
A programming interface for HTML documents.

HTML Editor

A software program for editing HTML pages. With an HTML editor you can add elements like lists, tables, layout, font size, and colors to a HTML document like using a word processor. An HTML editor will display the page being edited exactly the same way it will be displayed on the web.


A form that passes user input back to the server.


The same as an HTML Document.


Code to identify the different parts of a document so that a web browser will know how to display it.


Hypertext Transfer Protocol
HTTP is the set of rules for transferring files (text, graphic images, sound, video, and other multimedia files) on the World Wide Web.

HTTP Client

A computer program that requests a service from a web server.


Hyper Text Transfer Protocol Secure
Same as HTTP but provides secure Internet communication using SSL.

HTTP Server

A computer program providing services from a web server.


Record stream capture videos from Hulu™.


On the Web or other hypertext systems, hyperlink is a synonym for both link and hypertext link.


An extension to hypertext to include graphics and audio.


Hypertext is the organization of information units into connected associations that a user can choose to make. An instance of such an association is called a link or hypertext link.


H.264 is a high quality, small file size, video compression standard.

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