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Design: Computers are used both by design engineers and artists for design. Computer Aided Design (CAD), Very Large Scale Integration (VLSI) chip design, etc.
Simulation: Computers, since their invention, have been used to simulate processes. It was only natural to try and use the computer to simulate visual objects as well. Flight simulators, computer games, virtual reality are all examples of how computer graphics plays an important role in simulation. Just about anything that can be experienced visually can be simulated to some extent with a computer.