Just to add some details to that link, it's a network streaming app that lets you remote into another machine and depending on your network configuration it's often fast and responsive enough to play games (I played through Celeste which is a very twitchy precision platformer with no issues). It's also just cool streaming something like Cyberpunk on ultra settings to your phone. There are moonlight clients for nearly any device.
To host moonlight you used to be able to just do it natively through Nvidia gamestream but they turned that feature off. You can use Sunshine now to host https://github.com/LizardByte/Sunshine