Waves in nature arise from the transfer of energy between different forms, leading to oscillations that propagate through space. The discussion highlights that pressure waves result from pressure differences, likening their behavior to a domino effect where one wave triggers the next. This principle applies across various mediums, including air, water, and even electricity. Waves occur when energy can oscillate between two storage forms; for sound waves, this involves pressure and kinetic energy, while light waves involve electric and magnetic fields. Understanding these mechanisms clarifies how waves function in different contexts.