Lasers are devices that emit light through a process called stimulated emission. They produce a highly focused beam of light that can be used in various applications, from medical procedures to cutting materials. The unique properties of laser light, such as coherence and monochromaticity, make it distinct from regular light sources. In medicine, lasers are used for surgeries, skin treatments, and vision correction, showcasing their versatility. In industry, they play a crucial role in manufacturing and telecommunications. Overall, lasers have revolutionized many fields, demonstrating the power of focused light in technology and science.