LetMeReShade is a free plugin that makes it easy to apply shaders and tweak graphical settings on compatible Steam Deck games ...

NVIDIA has a useful overlay that can enhance your gaming experience's visuals and provides a bunch of useful tools you probably didn't know existed.

The placement of a full-motion video window on a display screen ... For example, an earlier analog TV tuner added to a computer created an overlay on screen. THIS DEFINITION IS FOR PERSONAL ...

you can take advantage of the Nvidia Game Overlay to access useful features related to gaming. This includes tools for quick game recording with high refresh rates and video quality, performance ...