Not the one you think of – the one where you can start the commercial apps or games just by tapping on it. There’s no real iOS emulator until today! Period.
They are either fake iOS emulator, or just an iOS simulator, or iOS IDE/GUI for developing iOS apps/games and some can contains malicious codes to steal/block/harm your PC/Mac/Android data. If you run across Google and find something related to iOS emulators, I’m telling you, for your own safety, try to stay away from those things. Don’t be disappointed folks but until today there isn’t any REAL Apple iOS emulator to run iOS apps and/or to play iOS games.