A small program or application, which is usually written in Java, and runs on a Web browser. An applet powers some of the fancier features of Internet pages, such as animation. They download quickly and are used both online and offline.

Attachment-A file or group of files that are included with an e-mail message. You can attach files through most e-mail programs. To attach a file to an e-mail, simply click the “attach file” button (or similar button). This will open a menu that will allow you to browse through your computer to find the file or image that you’d like to attach. Never open any attachment you receive from someone you do not know: it may contain a harmful virus.