Sorry for my English, but I am not native speaker...
My sample website use - Apache - it set in: Server -> Services management, and: Web Server (Apache) is ON, but Web Server (Apache) is OFF. Now I set Apache OFF, and nginx ON, after this I do the reset of my server, and after this operation Apache is ON and nginx OFF.
Can nginx run all the time without Apache?
I know Magento works better on the nginx.... so is Plesk good server application if I want to use only Magento webstites?
What does it mean: "frontend for Apache" ?? what I can gain using it? is any test of speed?