

It’s a term few decades old, and means transferring files between local devices.
You download the app on your pc, you sideload it to your local device (your phone) using adb sideload file.apk, and you use that installed app to upload pictures of your mom.
Everyone now having internet access in those local devices means you can do the download on it directly, but for android, the process is still there and used whenever you install stuff not from the play store.

While true, the way DLSS 2/3/4 does it is to take a bunch of low res renders of the game over time while wiggling the camera very slightly, and stitch them all together to generate a new, higher res image that very closely matches what the original would have looked like. The GenAI part is essentially just a very advanced temporal blending function that’s really good at detecting and smoothing out edges.
DLSS 5 then runs an AI Instagram filter on top of the frame for “enhanced visuals”, because obviously we want our games to look like cheap AI slop.