Computer Simulations allow us to model real life situations without the expense or danger of trying things in real life. For example, trainee pilots will practice on flight simulators before being allowed to pilot a real plane. This is both safer and more cost efficient.

It allows us to experiment with changing settings and variables to see their effect quickly and easily. For example, this rollercoaster simulator allow us change the height and speed of a rollercoaster track to check whether it would be safe but still exciting.

It allows us to model what might happen in the event of a natural disaster. For example, this wildfire simulator allows us to see the speed with which fires can spread and to practice ways of halting their spread.

This nuclear power plant simulator allows us to experience disastrous events without disastrous consequences.

Sometimes practicing with simulators prepares people for real life situations. For example, this hang-glider simulator allows people to practice an activity which could be dangerous to do without the correct training and learn the principles of staying in the air. And a sailing sim allows us to see the effects of moving the rudder and trimming the sail on a yacht.

Scientists and engineers use simulations to model real world events. For example this simple physics lab simulator can be used to show and measure the effects of gravity, pendulums, molecular movement and collisions.

A train simulator could be used for the training of prospective drivers. A camera simulator tries to explain the principles of shutter speed, exposure times and film speed and their effect upon photographs.

Some simulators which require you to register include SimSchool and Intel's IT Manager Game. Medical sims allow students to practice complicated procedures without harming real patients. CyberNations allows you to learn about the issues affecting world leaders.

Other simulators include a paper plane simulator, an airport security simulator and the Oil God simulation.

The Traffic Simulator shows the effect on traffic of different events such as a lane closure, traffic lights, an on-ramp etc.

Stopping Distances is a road safety simulator that shows you the effect of different speeds and factors affecting braking conditions in a car.

Other examples include a simple flight simulator, a complex submersible simulation and a more straightforward submarine simulator.