These software programs enable a computing device to mimic the functions of a different computer system. On Apple’s mobile operating system, this facilitates running software or playing games designed for other platforms, such as classic video game consoles or legacy operating systems. For example, one could use such a program on an iPhone to experience titles originally released for the Nintendo Entertainment System.
The capability to replicate other systems’ behavior is valuable for several reasons. It allows access to a wide range of software unavailable natively. It preserves classic games and applications, enabling users to revisit nostalgic experiences. Furthermore, it offers developers a way to test software on multiple virtual environments without needing dedicated hardware for each.