This is incorrect! While we only see one side of the moon from Earth, it's not because there's a hidden dark side. The reason is that the moon's rotation period is perfectly synchronized with its orbital period around Earth, meaning it takes the same amount of time to rotate on its axis as it does to orbit our planet. This is why we always see the same face.

Both sides of the moon receive sunlight, and while one side is always facing Earth, the other side gets its fair share of sunshine as well.