1. Acronym for Common Gateway Interface. The specification that defines communications between information servers (such as HTTP servers) and resources on the server’s host computer, such as databases and other programs. For example, when a user submits a form through a Web browser, the HTTP server executes a program (often called a CGI script) and passes the user’s input information to that program via CGI. The program then returns information to the server via CGI. Use of CGI can make a Web page much more dynamic and add interactivity for the user. See also CGI script, HTTP server (definition 1).
2. See Computer Graphics 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.