what is ment by virtual cd rom?

what is ment by virtual cd rom?

Virtual cd-rom is software used to mimic a physical cd or cd-rom drive. The software loads a cd model file, (like an ISO) which is a copy of a genuine cd or one made of files complied to have impossible to tell apart properties as a cd. The operating system then see this as a new cd-rom drive near a cd in it, usually next to it's own drive letter.