to all. The moon is locked to the Earth, meaning that it always points the same face towards our planet. The dark side of the Moon is the side that we cannot see from Earth because it is permanently facing away from us.
Yes, the moon is "Tidally locked" to the earth. The side of the moon permanently facing away from us experiences light and dark (day and night) in a 29.5 (earth) day cycle, just the same as the side that faces the earth. The lunar hemisphere that faces away from the earth is more accurately described as the "far side of the moon". No educated person calls it the dark side...