CGI stands for Common Gateway Interface. A standard for interfacing web servers with an executable application. A CGI program can be written in any language like Perl or C/C++ and it is often stored in a special directory like /cgi-bin.
CGI programs are the most common way for Web servers to interact dynamically with users.
Many HTML pages that contain forms, for example, use a CGI program to process the form’s data once it’s submitted.
Another increasingly common way to provide dynamic feedback for Web users is to include scripts or programs that run on the user’s machine rather than the Web server.
These programs can be Java applets, Java scripts, or ActiveX controls. These technologies are known collectively as client-side solutions, while the use of CGI is a server-side solution because the processing occurs on the Web server.
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