3D displays are technology that creates the illusion of depth in images, allowing viewers to see objects as they would appear in the real world. This is achieved through various methods, such as stereoscopy, which uses two slightly different images for each eye, or holography, which captures light fields to create a three-dimensional effect. These displays are commonly used in virtual reality (VR) and augmented reality (AR) applications, as well as in cinema and gaming. They enhance the viewing experience by making images more immersive and engaging, providing a sense of realism that flat screens cannot achieve.