https://www.reddit.com/r/gifs/comments/4a9hgz/how_to_pick_a_lock_with_two_bobby_pins/

All of the American keys tend to be the simple like in the gif whereas the Europeans use a crazy diverse variety of weird keys or weird tumblers. Euro locks turn a full 360 degs to lock, where as US only turn 90 degs. They also latch at 3 points, as opposed to 1 in the US.