Our 3D images are captured by a set of cameras that have the same separation as eyes in humans. These images are latter stitched to form a set of two images of 360 degree for each eye. They are also called stereoscopy imaging and they create the illusion of depth in an image. Stereoscopic images provide information that makes the brain calculate and see depth in the images.
These images are used in special 3D monitors, or virtual reality headsets that display the images for a each eye simultaneously.