Licht is the German word for "light." It refers to the natural agent that stimulates sight and makes things visible. Light can come from various sources, including the sun, artificial lamps, and fire. It plays a crucial role in our daily lives, influencing everything from mood to the growth of plants. In physics, light is understood as electromagnetic radiation that can be perceived by the human eye. It travels in waves and can be described in terms of its wavelength and frequency. The study of light encompasses various fields, including optics and photonics, which explore its properties and applications in technology and science.