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 patterns to create three-dimensional images. These displays are commonly used in virtual reality systems, cinemas, and video games, enhancing the viewing experience by making it more immersive. As technology advances, 3D displays are becoming more accessible, with applications in fields like medicine and education for training and visualization purposes.