Thunder is a powerful and awe-inspiring natural phenomenon that occurs during a thunderstorm. It is the loud rumbling sound that is produced by the rapid expansion of air surrounding a lightning bolt. The sound of thunder can range from a low, distant rumble to a loud, booming roar, depending on the distance and intensity of the storm. Thunder is often associated with dark storm clouds, heavy rain, and flashes of lightning, creating a dramatic and intense atmosphere. In many cultures, thunder is seen as a symbol of power, strength, and divine energy.