There is a 'dark side' of the moon, but you are probably using the term incorrectly all of the time
Close-up Of The Surface Of The Moon Photograph by Stockbyte
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Moon_photo_by_Sean_Buerger
Lunar Landscape Moon Surface 00:20
Full Moon at February Perigee Bark At The Moon, Howl At The Moon, Big Moon, Full Moon, Cosmos, Photographing The Moon, Impact Crater, Moon Icon, Astronomy Pictures
Phases are caused by the changing angle of the sun as the moon orbits the Earth. The cycle begins with a new moon then becomes a waxing, or growing crescent moon, before the 'first quarter moon,' which appears half illuminated. It then waxes to a gibbous moon before becoming a full moon (pictured)