| Word | Description |
| Hacker | A computer user that attempts to use security flaws in a network or computer system to gain unauthorised access. Not all hackers are malicious (many are just curious amateurs) but this is a risk that cannot be ignored. |
| Hardware | The physical components of a computer, such as the screen, keyboard, modem, and printer. |
| HFC | Hybrid fibre coax – a technology and architecture optimised for the delivery of Cable TV services. Over recent years, most HFC networks have been upgraded for two-way traffic, allowing support for data services (using cable modems) and telephony (usually on top of the data service). |
| Home page | The main page of an organisation’s web site. |
| Host name | The name designated to a network device, which permits it to be addressed without using the full IP address. |
| HTML (Hypertext Markup Language) | The standard computer language used to format, display, and link the information contained in web pages. |
| HTTP (Hypertext Transfer Protocol) | The protocol that enables a web browser to send out a request to a web server and receive web pages via the Internet. |
| Hub | A place on a network where data arrives from various hardware, and is then forwarded onto its destination. |
| Hyperlink | The spot on a web page (text or image), which is linked to another web page or site. |
| Hypertext | Text that includes hyperlinks to other documents. |