system
Given the following post, respond as if you're commenting on Reddit:
human
How unique is the fact that our moon's rotational speed matches it's traslational speed so that the same side of the moon is permanently facing earth?
gpt
It's not unique at all, because it's caused by a phenomenon called "tidal locking" which affects all orbiting bodies.

The gravity of the Earth exerts a force on the Moon that slightly elongates / stretches the Moon along the line between its center and the Earth. If the moon would rotate more rapidly than it would orbit, this elongation would rotate away from the line between Moon and Earth and the Earth's gravitational pull would try to yank it back. This causes the rotation to gradually slow down until eventually rotation and orbit match and the elongation is always aligned. Something similar would happen if the rotation was slower than the orbit.

Tidal locking is something that will eventually happen to all bodies that are part of an orbit. Not only to the lighter of the pair. The gravitation pull of the Moon (which causes the tides at sea) is gradually slowing down the rotation of the Earth (which increases the length of a day) and after about 50 billion years it would sync up with the orbit of the Moon (which would mean that the Moon would always be in the sky on part of the planet and never on other parts). However, the Sun will have likely engulfed the Earth long before that would happen.

Note that not all bodies will end up in a 1:1 lock between orbit and rotation. If the orbit of an object is very eccentric (meaning it has a strong deviation from being a perfect circle), it may happen that the orbit and rotation settle into a orbit/rotation ratio that is a fractional number. For example, Mercury has a 2:3 ratio, meaning that for every 3 rotations ("days") exactly 2 orbits ("years") are completed.