system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How come we always see the same side of the moon, thus it rotates around its own axis at the exact same speed s it rotates around the earth; and do moons of other planets behave the same way?

If not: what makes our moon different?
gpt
Lots of moons, but not all of them, exhibit the same behaviour.  It's a phenomenon called "tidal locking", and how it works is a little complicated.

Essentially, the parent body exerts tidal forces on the satellite which cause it to bulge in certain directions.  If that body is rotating in the corotating reference frame of the two bodies (meaning if you can look at the world as though neither is moving and still see the satellite spin), that will carry the tidal bulge out of alignment with the gravitational forces, so they'll drag it backwards.  Over a very long time, these effects add up, until the satellite is rotating with the same period as its orbit.