CGI

That's a million dollar question, which you ought to know before you delve any deeper into the subject. Well, CGI (Common Gateway Interface) is actually a mechanism which deals with server side programs which can be written in a number of programming languages.(Hang on for the details).

The basic function of a CGI program is to receive and translate data sent by the user via the Internet to your WWW server. Depending upon the user's request,the CGI program processes the user's requirements and sends valid response back to your WWW client.

After knowing the basic function of CGI program, the most obvious question in your mind would be, why common gateway interface (CGI) is called a gateway! The reason behind this is that, your program acts as a gateway or interface program between other larger applications. You may create a CGI program that translates and formats the data being sent to it from applications such as online catalogs. This translated data is then passed to some type of a Database program, which performs manipulation on its Database and. returns the results to -your -CGI - program. The CGI program can then reformat the returned data as required for the Internet, and return it to the Aline catalog customer, thus acting as a gateway between the HTML catalog, the HTTP request, and the Database program.

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