Allows FastCGI processes to be separated from web server process : * Easy creation of chmoded socket. * Privilege separation without needing a suid-binary, or running a server as root. * You can restart your web server and the FastCGI applications without restarting the others. * You can run them in different chroot()s. * Running your FastCGI applications doesn’t depend on the web server you are running, which allows for easier testing of/migration to other web servers.