3D glasses are special eyewear designed to create the illusion of depth in images, making them appear three-dimensional. They work by filtering different images to each eye, allowing the brain to perceive depth. This technology is commonly used in movies, video games, and virtual reality experiences. There are various types of 3D glasses, including anaglyph glasses with red and blue lenses, polarized glasses, and active shutter glasses. Each type uses different methods to achieve the 3D effect, catering to different viewing environments and technologies. These glasses enhance the visual experience by immersing viewers in a more lifelike scene.