The two big features introduced in Unreal Engine 5. Lumen is a form of ray tracing for lighting/reflections and Nanite is virtualized geometry that is too complex to explain here but in old school terms, it means a metric boat load of polygons without pop-in (when used properly).
Lumen is the global illumation system used by UE5, Nanite is a geometry system that uses virtualized micropolygons. They are pretty neat technologies to be honest...
After does that make a game good? Absolutely not!
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imaging shaded areas, but with tons of smearing and constant artifacting
After does that make a game good? Absolutely not!