What is the difference between a simulator and an emulator?

A simulation game, or sim game, (also known as a game of status or mixed game) is a game that contains a mixture of skill, chance, and strategy to simulate an aspect of reality, such as a stock exchange. In computer games simulation games is a wide super-genre covering titles such as MS Flight Simulator, SimCity, Civilization and The Sims. Some simulation games are intended to simulate the real world; others are intended to simulate a fictional world; still others are designed to be able to do both.