CGI is the part of the Web server that can communicate with other programs running on the server.
What is The Common Gateway Interface?
The Common Gateway Interface (CGI) provides middleware between WWW servers and external databases and information sources. The World Wide Web Consortium (W3C) defined the Common Gateway Interface (CGI) and also defined how a program interacts with an HTTP (Hyper Text Transfer Protocol) server.
The body of the message is sent to the CGI program by the server through the stanard input pipe. Using the value of content_length, which indicates the length of the body, the CGI program can parse the input and obtain the values of the data entered by the user.
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