What is the relation between what is in the ROM memory and Windows or any operating system?

the realation ship between rom and windows or o.s   , when manufacturures are made rom and fix certiain bootable files on it that help the operating system to start  . manufacturer made rom by collecting the all suitable fiie store in rom compatable with the O.S .  when you are loading a operating system  that helps o.s to installing the o.s .

Memory in the computer is the hard disk, it will help you in the biggest load is capable of loading As for