There are two distinct options to run PHP using the web server. One is using the PHP’s CGI and the other one is FPM. FPM is a process manager to manage the FastCGI in PHP. Apache ships with mod_php by default and works with all major web servers. With mod_php there is a little performance issue because it locks out the process.

Source: LXer – How to Install PHP-FPM with Apache on Ubuntu 22.04