A laser is a device that emits a focused beam of light through a process called stimulated emission. The light produced is usually monochromatic, meaning it consists of a single color or wavelength, and is highly coherent, allowing the light waves to travel in parallel. Lasers are used in various applications, including medical procedures, communication technologies, and manufacturing. The term "laser" stands for Light Amplification by Stimulated Emission of Radiation. Lasers can vary in size and power, from small handheld devices like laser pointers to large industrial machines. They are also used in everyday items, such as barcode scanners and CD players, showcasing their versatility and importance in modern technology.