Squeezed light refers to a special state of light where its quantum properties are manipulated to reduce uncertainty in one property, such as its phase, while increasing uncertainty in another, like its amplitude. This technique is important in quantum optics and can enhance the precision of measurements in various applications, including quantum computing and gravitational wave detection. The concept of squeezed light arises from the principles of quantum mechanics, where light behaves both as a wave and a particle. By using devices like nonlinear crystals, researchers can create squeezed states of light, which can lead to improved performance in interferometry and other advanced technologies.