FastCGI is a protocol for interfacing interactive programs with a web server, significantly enhancing the performance of web applications. It is a variation of the earlier Common Gateway Interface (CGI); FastCGI's main advantage is its ability to persistently handle requests without creating a new process for each one, reducing the overhead associated with web server-to-CGI communication. This makes it highly efficient for running applications in languages like PHP, Python, and Perl on a web server, offering improved speed and resource management.
