understands that there is software that improves video viewing through an NVIDIA video card

1. Not exactly explained on the site How does it work ?
Is it real-time movie viewing software or film production ?
2. Suppose I install the SDK, how do I run the software ? Driver that will give me high quality video ?
How does this quality?
3. What video card do I need to get the best video quality ?
4. Do you need a special movie player ? Do it work with YouTube ?
5. DLSS: What Does It Mean for Game Developers?
Is this software to create games? Not suitable for those who want to improve videos (in real time)

Nothing is understood in this software