Question [Q] Will changing my fw using kdz revert everything back to stock?

Sorry for the noob question...

I currently have root, clockworkmod and Nova Rom on my Optimus Black. If I run KDZ FW Updater and update the firmware with my stock firmware... Does it means that the root, Nova Rom and clockworkmod will be no longer there

Ps* idk the difference between roms and firmware

Thanks in advance!