A simulator is a software that helps your computer run certain programs built for a different Operating System. They are mostly meant for iPhone and iPad devices, unlike Android devices that can be emulated easily.

What is a simulator definition?

: one that simulates especially : a device that enables the operator to reproduce or represent under test conditions phenomena likely to occur in actual performance.

What is emulator and simulator in testing?

For testing mobile apps, an emulator may be a desktop application that mimics the hardware and OS of the applications to be tested. A simulator does not mimic the hardware/OS, but rather the basic behavior of a device. While simulators are usually simpler, they are not as useful as emulators.