ELI5: Explain Like I'm 5

Simulation

Simulation is like playing a video game. It's when you use a computer to pretend you're doing something or going somewhere, or experiencing a situation, even though you're actually just sitting at your computer. For example, you might use a computer to simulate driving a race car, flying an airplane, or even running a business. The computer program makes it so that you can experience things that you could not do in real life.