A Microsoft technology that allows small programs to run inside your browser.
A supplement to a piece of software that gives an added layer of functionality: for example, add-ons in Mozilla Firefox can allow you to take pictures of the screen or remove adverts.
Part of your email software where you store details of your friends' and contacts' e-mail addresses so you don't have to remember them.
Used to create and play interactive videos, games and other multimedia items on the internet. You may need to install a plug-in to view Flash content on your browser.
Software which you can use to view and edit images.
'Asymmetric Digital Subscriber Line' - a type of broadband technology used for connecting to the internet.
Plugs in to your telephone line to stop broadband and telephone signals from getting mixed up, or interfering with each other.
Also known as a DSL modem, this is used for connecting a computer to the internet.
A form of spyware which installs programs which generate advertising on your computer (often in the form of pop-up windows).
Letters at the start of the "alternative" user-originated newsgroups ranging from alt.bill-gates to alt.yoga. Can also mean 'alternative'.
The text which appears when you roll the mouse over a picture. This is the alt tag in HTML and is useful for people who view pages in text-only mode, or who are blind or visually impaired.
An operating system developed by Google for mobile phones and other hand-held devices.
A GIF is a type of image file. When it is animated it might blink, flash or have moving pictures.
Pictures which are combined in a certain way so they appear to move. Cartoons are animations.
Anti-spyware software helps stop people from spying on your computer and stealing your data.
Anti-virus software helps protect your computer from viruses.
Formerly known as American Online, this company used to be the world's largest Internet Service Provider (ISP).
Free open-source software used on over 50% of the internet's web servers.
A company set up by Steve Jobs, Steve Wozniak, and Ronald Wayne in 1976, which makes computers (such as Macs), MP3 players (iPods), software (such as iTunes) mobile phones (iPhones) and more.
A series of computers made by Apple. The first Macintosh was released in 1984.
Another word for computer program. For example, Microsoft Word (which is used for creating text documents) is a word processing application.
The place on a website where you find old articles, stories etc.
To move old files which may not still be in use or relevant to a separate storage area.
A computer code that represents letters as numbers. For example, the letter A is ASCII code 65.
When plain text characters are arranged on the screen in such a way that they create an image.
A file which has been attached (sent with) an email. This could be an image, a video or any other document. You can usually attach a file to an email by clicking an icon in the shape of a paperclip.
A website (such as eBay) where people can bid money on different items for sale.
A sound file (for example, some music) which has been placed on the internet to either download or listen to online.
When your computer has been set to automatically connect to a service (for example, the internet) whenever it detects that it is available.
A picture or cartoon of yourself or a favourite character that you use to represent yourself in games, on message boards or on social networking websites.