A CGI program is any program designed to accept and return data such as filling out and submitting a form. CGI programs can be written in several programming languages including C, Perl, Java, or Visual Basic. CGI programs are the most common way for a web host server to interact dynamically with internet users. Another common way to provide dynamic feedback for Website users is to include scripts or programs that run on the user's machine rather than the Web server. CGI is server-side oriented. Below are the best cgi web hosting companies on the internet tried and true.