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The following glossary defines common web hosting terms.
Certificate Authority
An issuer of Security Certificates used in SSL connections.
CGI
(Common Gateway Interface) - A set of rules that describe how a Web Server communicates with another piece of software on the same machine, and how the other piece of software (the 'CGI program') talks to the web server. Any piece of software can be a CGI program if it handles input and output according to the CGI standard. Usually a CGI program is a small program that takes data from a web server and does something with it, like putting the content of a form into an e-mail message, or turning the data into a database query.
Cgi-bin
The most common name of a directory on a web server in which CGI programs are stored. The 'bin' part of 'cgi-bin' is a shorthand version of 'binary', because once upon a time, most programs were referred to as 'binaries'. In real life, most programs found in cgi-bin directories are text files -- scripts that are executed by binaries located elsewhere on the server. While most programs using CGI are stored in this directory, it is not a requirement for using CGI.
Clustering
Connecting many computers and making them appear as one machine. This is done to increase reliability and performance.
ColdFusion Hosting
Web hosting that supports ColdFusion, a web application language introduced by Allaire and currently owned by Macromedia.
Colocated Hosting
When one party houses their web server(s) at another company's location for Internet connectivity.
Co-Location
Network Operations Centers offer the ability for customers to place their webservers and other network equipment in thier NOC which are connected via high speed fiber data lines to the backbone of the Internet. Administration is done remotely so that a customer far away can configure and control their network equipment.
Control Panel
A web interface so customers can administer their account.
Cookie
The most common meaning of 'Cookie' on the Internet refers to a piece of information sent by a Web Server to a Web Browser that the Browser software is expected to save and to send back to the Server whenever the browser makes additional requests from the Server.
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