https://www.pcgamer.com/what-is-ray-tracing/

Nvidia's Sol demo makes extensive use of real-time ray tracing.

What is ray tracing? That question just became far more relevant for PC gamers, as the new Nvidia GeForce RTX 2080, GeForce RTX 2080 Ti, and GeForce RTX 2070 are adding dedicated hardware to accelerate ray tracing. All of those graphics cards use Nvidia's new Turing architecture, which promises to be the most revolutionary jump in GPUs that we've seen in a long time—perhaps ever. Will these be the new best graphics cards when they become available, or are they priced too high?