Why Do We Need Polygons In 3D Video Games?

What are polygons, and how do they make our favorite games three-dimensional? Let’s explain.
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Footage via: https://www.youtube.com/channel/UConzx4k6IVXSs9PsY9Snkbg

Video Credit [1:10 -1:22]: Bart de Vries

(https://www.artstation.com/bartndv)