Common Gateway Interface. CGI programs allow Web servers to interact dynamically with users. For example, when you type information into a form on a Web page, a CGI program can be used to process and store the information you enter.

Another way to prove you are you are. CHAP allows you to login to your IRC without a terminal screen. This method is more secure than password authentication (PAP) because there is never a text based password.

Store data in such a way that the file size is reduced.

A cookie is a message given to a Web browser by a Web server. The browser stores the message in a text file. The message is then sent back to the server each time the browser requests a page from the server.

The main purpose of cookies is to identify users and possibly prepare customized Web pages for them. When you enter a Web site using cookies, you may be asked to fill out a form providing such information as your name and interests. This information is packaged into a cookie and sent to your Web browser which stores it for later use. The next time you go to the same Web site, your browser will send the cookie to the Web server. The server can use this information to present you with custom Web pages. So, for example, instead of seeing just a generic welcome page you might see a welcome page with your name on it.

A website can only read the cookies it has stored on your computer itself. It can not read cookies set by another website.

Are cookies bad? Cookies do not act maliciously on computer systems. They are merely text files (on windows, on Macintosh cookies are typically stored in a single combined file) that can be deleted at any time - they are not plug-ins nor are they programs. Cookies cannot be used to spread viruses and they cannot access your hard drive. This does not mean that cookies are not relevant to a user's privacy and anonymity on the Internet. Cookies cannot read your hard drive to find out information about you; however, any personal information that you give to a Web site, will most likely be stored in a cookie. In only this way are cookies a threat to privacy. The cookie will only contain information that you freely provide to a Web site.

CSS is a set of standards that are recommended for presenting certain elements on websites from the World Wide Web Consortium.

The non-physical world created within computer systems. The term originated by author William Gibson in his novel "Neuromancer", the word Cyberspace is currently used to describe computer-aided communication. When you're connected to the Internet, for example, you are 'in cyberspace'.