Why do we see only one side of the moon?

Because the other side is shy.

No.

Our moon takes about 27 days to rotate around its own axis and 27.3 days to revolve around the earth.

This means the moon rotates around its axis at almost the same rate or speed as it revolves around the earth.

Hence, the same side of the moon is constantly facing the earth.

Making us see only one or same side of the moon.

However, if the moon did not rotate on its axis, then we could see the other side of the moon.

We would also see the other side, if the moon rotated in 13.5 days, i.e., it made two rotations in one revolution.

But this is not the case.

However, an interesting fact is that due to the elliptical orbit of the moon.

We can see almost 59% of the moon's surface.