3D: 3D means three-dimensional, i.e. something that has width, height and depth (length). Our physical surroundings is three-dimensional and we progress around in 3D every day.
Humans are capable to perceive the spatial link among objects just by looking at them because we have 3D perception, also recognized as depth perception. As we look around, the retina in each eye forms a two-dimensional figure of our surroundings and our brain processes these two images into a 3D visual experience.
However it's essential to note that having visualization in both eyes (stereoscopic or binocular vision) is not the only way to see in 3D. People who can solitary see with one eye (monocular vision) can still observe the world in 3D, and may even be unaware that they are stereo blind. They are simply missing one of the tools to see in 3D, so they rely on others without thinking about it.
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