It will support ray-tracing, a special rendering technique that helps create image by “tracing” light as pixels.
The system will still use 100GB Blu-ray discs and disc drives for games and won’t rely solely on hard drive storage, but Sony did confirm that all games, even when loaded from a disc, will have to be installed to the massive hard drive.
Source : https://www.distractify.com/p/ps5-release-date-sony-playstation