Its not your engine. Its the fan running to cool the engine down. They all do it and nothing is wrong with your car.
Because you turned the key.
You take hold of the key and pull towards yourself. If you turned the key, turn it back the original way you turned it then pull towards yourself
That's ok. The car is doing it's job, which is cooling the engine down even if key is not in the ignition because the sensor stops after it reaches a set temperature or degree.
Turn the ignition key to "acc" to release the steering mechanism without starting the engine, shift the lever to park, turn the ignition key back to lock and remove key. If the car is at a full stop, nothing will happen to the transmission, so's long as it isn't done often.
Might not be sensing the microchip in the key to match with the car.
Nothing
check the battery, and make sure it is in park
A very low (but not quite dead) battery will do that. It's the starter relay trying to work.
igination on car is turned off but car still runs
Defective ignition switch, or bad starter.
what kind of car? IF its fuel injected the key turns off the computer, the fuel pump, and the ignition coil