system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do standard-transmission cars stall when stopped and in gear, but automatics don't?
gpt
Stick shifts have friction plates coupling the wheels with the engine. Stop one, and the other has to stop as well. The friction is too strong.

Automatic transmissions have a fluid coupling between the movement of the wheels and of the engine. The motion is transferred by one set of turbines being driven and dragging along another set of turbines through the motion of transmission fluid. Block one set of turbines and the other continues to have some degree of freedom. There is friction, but no solid parts pressing against each other.