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So you build your website and you have lots of hits, but you want to interact with your users, then you will need to insert some forms. You may want to add an order form, or a guestbook, or even a poll. The HTML code will insert the form fields that are needed, but you will need CGI to retrieve and process the information that is sent by those fields. CGI stands for Common Gateway Interface, this is not a programming language like HTML, it is a protocol. This step is necessary to process and translate the information sent because the server maybe on a different platform (PC, MAC, or UNIX) than the platform that the user is on.
There are various languages you may decide to do something with the information that is sent, some are: ASP, JSP, Perl, or Vbscript. The one you will choose depends on the web server you are using and what that server is able to use.
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