Nvidia’s software bits for upscaling (game plays with lower resolution, GPU does funny things to make it look higher resolution), frame insertion (in a nutshell, creating fake frames in between real frames to make gameplay look smoother), and similar. Many of the features require game support though, so a majority games are unable to utilise the more advanced features. They can also result in a degradation in quality and increased latency.

DLSS 4 introduced multi frame gen, where up to three fake frames were made for every one. It doesn’t magically make you have 4x the performance (so no, the 5070 is not the performance of the 4090), but it’s still pretty neat tech.

DLSS 5 is being criticised as it’s “enhancing” video game graphics to look like AI-generated images that look more “cinematic” and “photorealistic”. To quote an IGN article, “I think it looks shit.” (https://www.ign.com/articles/nvidias-dlss-5-is-a-slap-in-the-face-to-the-art-of-video-game-design)

In other words, it’s removing the human element of game graphics and nobody likes it.