Most people who are developing software for iOS use emulators but others want to play iOS games on their PC or Mac.
The best thing about emulators is that you can use it as a normal phone with wifi to open safari, YouTube, and all the other apps. The PC will use software which “emulates” an iPhone and lets you run anything on it. Now to run the iOS apps on a different OS for which the apps were not made, here we use emulators. In simple words, we can say an emulator is any software that lets you run software made for other operating systems, in our case we are running iOS apps on our PC.