Stereoscopic systems are technologies that create the illusion of depth in images by presenting two slightly different perspectives of the same scene. This mimics how human eyes perceive depth, as each eye sees a slightly different view. Common applications include 3D movies, virtual reality, and certain types of photography. These systems typically use special glasses or displays to filter the images for each eye, allowing the brain to combine them into a single three-dimensional image. Popular formats include anaglyph, polarized, and active shutter systems, each employing different methods to achieve the 3D effect.