How CGI Works?

The Common Gateway Interface (CGI) is an interface to the Web server that enables you to extend the web server's functionality. Using CGI, you can interact with users who access your site. It is the manner of communication that a server employs to send useful information back and forth between your browser and a computer program on a web server.

CGI communication is handled over the standard input and output, which means that if you know how to print and read data using your programming language, you can write a Web server application. Other than parsing the input and output, programming CGI applications is almost equivalent to programming any other application.

A CGI program can take advantage of any resource available to its output. It can also accept input from the user by accepting the contents of a form filled out by the user. These two basic capabilities have led to a wide variety of applications.

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