Anaglyph glasses are special eyewear designed to create a three-dimensional (3D) effect when viewing images or videos. They typically have one red lens and one cyan (blue-green) lens. This color combination allows the brain to perceive depth by filtering different images for each eye, making the visuals appear more lifelike. These glasses are commonly used with anaglyph images and 3D movies that are specifically created for this purpose. While they are a simple and cost-effective way to experience 3D content, they may not provide the same quality as more advanced technologies like polarized glasses or active shutter glasses.