It is performed throughout the world. A lot of organisms that survive are in no sense superior to those that have gone extinct. That's what evolution is about. That's why you can see it as a dance. It's not going anywhere, it's simply exploring a space of possibilities.
Dance can be art, ritual, or recreation.
The two main kinds of dance are those for participation, which do not need spectators, and those for presentation, which are designed for an audience. Dancing, besides giving physical pleasure, can have psychological effects. In some cultures, shamans dance in trance in order to heal others. The modern field of dance therapy developed as a means to help people express themselves and relate to others. In some societies, dancing often leads to trance or other xaltered states of consciousness.