A file attached to an e-mail message for sending between computers

Web log. Personal web page where the author can post their views and experiences and receive comments

Bitmap. The most common graphics file type for Windows PCs

List of your favourite web sites

Data that tracks visits to web sites and remembers user preferences

Free demonstration version of software that allows you to try before you buy

The size of the area on the hard disk where files can be stored

Transfer a file from another computer to your own

Software required for Windows to use a piece of hardware such as a graphics card

Electronic mail passed between computers

List of your favourite web sites

Program or device that blocks or allows Internet access to a network or a PC

Software to create and play web site animations

Text of a particular size and style

Software that is free to download and use for as long as you like

Physical parts of a computer system such as the hard disk, keyboard and printer

HyperText Markup Language. The code that makes up a web page

The main page of a web site, often a welcome page

A text or graphic you click on to go to another page or a different web site

A collection of inter-connected computer networks

Compressed graphics file for sending across the Internet

A text or graphic you click on to go to another page or a different web site

Malicious software such as virus or spyware programs

Device that links a computer to the Internet through a telephone line

Compressed audio file to save disk space and for transfer across the Internet

Acceptable behaviour online

Connected to the Internet

Fraudulent e-mails and web sites trying to trick you into giving out personal details

Extra programs that can be installed into larger programs to handle special tasks, such as playing certain types of movie files in a browser

Internet audio broadcast that can be played back on PCs or MP3 players such as the iPod

Small window that appears on a web page, often used for advertisements

A set of instructions to make a computer carry out a task

Software that hides system files and can allow attackers to access your computer undetected

Device used in home Internet networks to send data from the web to specific computers

Really Simple Syndication - a system to feed you news stories from web sites

Tool that searches the Web for keywords and provides relevant links

A computer that holds Internet data such as web site files and can send it to another computer when requested

A link you can click to go straight to a particular program or web page

Web sites based on communication and relying on users to add content

A program or a set of instructions to make a computer carry out a task

Junk mail messages to e-mail addresses

Software that tracks your movements on the Web for advertising purposes without your knowledge

Start playing music or video as soon as it begins downloading

Moving from one web page to another

Software that allows you to try before you buy

Malicious virus program disguised as useful software

Remove program files from a computer

Send a file from your computer to an online destination

Uniform Resource Locator. The address of a web site on the World Wide Web

Destructive program that infects and damages computer files

Video web log

Voice over Internet Protocol - voice conversations across the Internet

The standard audio file type for Windows PCs

Individual page on a web site

A collection of connected web pages located at a particular domain name

Web site that can be edited by users to add information

Microsoft operating system installed on most PCs

Information space on the Internet stored on servers across the world containing documents connected together through hyperlinks

Malicious code that uses an infected PC to spread itself to others