Light and dark are fundamental concepts in physics and perception. Light refers to the visible spectrum of electromagnetic radiation that allows us to see the world around us. It travels in waves and can be produced by sources like the Sun, light bulbs, and fire. Light is essential for photosynthesis in plants and plays a crucial role in various natural processes. Darkness, on the other hand, is the absence of light. It occurs when light sources are blocked or removed, creating shadows and dim environments. In darkness, our ability to see is limited, which can affect mood and behavior. Both light and dark are essential for balance in nature and human experience.