نور (Light) is a form of energy that is visible to the human eye. It travels in waves and can be produced by various sources, such as the sun, light bulbs, and fire. Light plays a crucial role in our daily lives, enabling us to see and perceive the world around us. In physics, light is studied as part of the electromagnetic spectrum, which includes other types of radiation like radio waves and X-rays. Light can also be reflected, refracted, and absorbed, leading to various phenomena such as rainbows and shadows. Understanding light is essential in fields like optics and photography.