What is supersampling in games?

Supersampling is when the console internally displays more pixels than the screen can display, and then uses that larger image and interpolates it to the appropriate number of pixels.

It is a method that generates high-quality frames and works effectively both as anti-aliasing (makes object edges free of obviously jagged pixel edges) and texture filtering (makes distant and tilted object textures look correct). and sharp, rather than blurry or weirdly distorted).

Smoothing makes edges appear sharp, not jagged

Without texture filtering, this paved road looks blurry when the angle becomes uneven; texture filtering makes the image sharp.

The advantage is that supersampling looks better than any other form of smoothing and filtering. The drawback is that it is much more computationally heavy than the more conventional AA/AF that is used in most games.

It sucks when there are no AA options in the game. Shadow of Mordor is one of my old favourites, but without AA it really needs supersampling because a lot of strings and roughness can look bad.