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From Wikipedia:

"The appeal of the Gran Turismo series is due significantly to the graphics, the number of licensed vehicles, the extent and detail of simulation, and the ability to tune performance. Handling of the vehicles is modeled on real-life driving impressions, tuning is based on principles of physics, and the sound of the vehicle's engine is based on recordings of real-life vehicles."

Summary: The level of immersion GT brings to the table.