What is S3D?

S3D most likely refers to Stereoscopic 3D. This is a technique for creating or enhancing the illusion of depth in an image by presenting two slightly different images to the viewer's left and right eyes. These 2-D images are then combined in the brain to give the perception of 3-D depth. It is commonly used in cinema, television, video games, and virtual reality to enhance immersion and realism.