In simple terms, spirituality is a worldview and a way of life based on the belief that there is more to life than what meets the senses, more to the universe than just purposeless mechanics, more to consciousness than electrical impulses in the brain, and more to our existence than the body and its needs.
Spirituality usually involves the belief in a higher form of inteligence or Consciousness running the universe, as well as life after death. It exists to satisfy the deeper human thirst for meaning, peace, mystery, and truth.