Games look better with High Dynamic Range (HDR) enabled. The technology allows for a greater range of colour and contrast to produce more glorious images on-screen. The issue is not every game offers HDR support—in fact, most don't. If you're using an HDR-capable gaming monitor but you don't play any games that are created with it in mind, you either have to resign yourself to never thinking about it or get active and utilise some software able to add (infer) HDR from SDR. There are a few such applications available, including Windows own Auto HDR, but you can now add Nvidia's new implementation to the list.
RTX HDR is a filter included with the new and improved Nvidia App. It uses AI to generate HDR information where there is none, meaning you can throw it at an SDR game and have a genuinely improved HDR picture come out the other side. It's a step removed from a true HDR implementation, but when HDR is not designed into a game it makes for a pretty good stand-in.
