The document discusses various uses of computer simulation including representing real world systems on a computer, training pilots by simulating flight environments, allowing nursing students to practice diagnosing and treating patients using lifelike mannequins, simulating vehicles to teach driving safely, using simulations in science classrooms to help students visualize problems, and simulating construction projects in engineering to plan buildings, bridges and slopes. Computer simulation is defined as modeling a real or theoretical system and executing the model on a computer to analyze the output.