Apache configuration is sometimes like this: it creates a lot of "workers" that are idle=waiting for an incoming connexion. As soon as someone makes a request and the web server handles it, it takes one "free" worker = "idle worker" and gives it the connexion. So, depending on your configuration, your may have a "fixed" number of workers, or a variable number of workers in what's called a pool ("a pool of workers").
Checkout Apache MPM
Apache configuration is sometimes like this: it creates a lot of "workers" that are idle=waiting for an incoming connexion. As soon as someone makes a request and the web server handles it, it takes one "free" worker = "idle worker" and gives it the connexion. So, depending on your configuration, your may have a "fixed" number of workers, or a variable number of workers in what's called a pool ("a pool of workers"). Checkout Apache MPM