https://www.cnet.com/news/nvidia-rtx-2080-vs-gtx-1080-a-next-gen-gaming-laptop-showdown/

Several key new features help differentiate the RTX 2060, 2070 and 2080 from the GTX cards that came before. Real-time ray tracing better simulates light, allowing for new kinds of reflections and more realistic scenes. Key is the ability to reflect objects that are off-screen, which has been next to impossible before now. Games that specifically support that include Battlefield V and Metro Exodus.

There's also DLSS, which stands for Deep Learning Super-Sampling, which uses cloud-based AI to simulate games at insanely high resolutions and teaches your GPU how to mimic that level of detail. This requires DLSS-compatible games, and the initial list includes Shadow of the Tomb Raider, Darksiders 3 and Anthem.