Key goes in, car detects key and some minor electrical functions start.
Key rotates to first click, whole electrical system starts up.
Key rotates second click, ignition turns on and the car is electrically ready to go.
Key rotates past second click. Starter motor swings gear into contact, spins engine shaft. Engine is turned over, sucks in fuel and air, starts the combustion process.
Key is released back to second click. Starter gear disconnects and motor stops. Car is running normally.
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