Flight simulators let you experience the thrills of flying without leaving the ground, so you can get a feel of what it'd be like to be the captain of a real passenger jet, even if it is just for a short 'flight'.
The cockpit may not be real, but it's very realistic and the flight simulator's instrument panels, dials, gauges and controls are all fully working so you will soon immerse yourself in the world of simulated flight training.