Feats are actions performed by various characters/entities that are used to show their power. Feats are one of the most important ways of gauging a character's power in the OBD, and therefore they are also the main points of argument on almost any thread. There are different types of feats, such as speed feats, strength feats, durability feats, and destructive power feats, intelligence/prep feats, etc. Some feats are more useful than others, since they can be more easily quantified.
For example, a character dodging a bullet from what looks like a Glock 17 can be analyzed since we know the muzzle velocity. A character dodging a ray gun beam from an unknown type of weapon cannot really be analyzed, since we don't know how fast it moves.
Feats are often collected and explained in respect threads. Characters/universes with a lot of hyperbole claims and few feats to back them up are generally looked upon with skepticism.
However, even feats can be discredited if they are unsupported by context of the story, whether by being far outliers, or retconned out of canonization.