Definition
Tidal forces from Earth have slowed down the moon's rotation so that the same side is always facing the Earth, a phenomenon called tidal locking. The other face, most of which is never visible from the Earth (18% of it can be observed over time due to libration), is therefore called the "far side of the Moon". The far side should not be confused with the "dark side" (the hemisphere that is not illuminated by the Sun at a given point in time), as the two are the same only during a full moon and, during a new moon, the near side is the dark side. Both the near and far sides receive (on average) almost equal amounts of light from the Sun. However, the term "dark side of the moon" is commonly used poetically to refer to the far side.
Read more about this topic: Far Side Of The Moon
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