What is MLAA

MLAA is a technology to antialias any jaggy image.

from youtube.com/watch

As the example image shows, it is used widely in games.

Original paper: cs.cmu.edu/afs/cs/academic/class/15869-f11/www/readings/reshetov09_mlaa.pdf The thumbnail is from this paper

How is it useful?

MLAA is designed to make images look high-res in a very short computation time, which means that it would help save render time. In addition, it could help smooth masks like cryptomatte.

Other algorithms

Other similar algorithms are for example SMAA and FXAA. They are also used for real time render.