Augments were a group of genetically engineered humans in the Star Trek universe. Typical among their traits were improved memory, strength, and toughness; they also typically developed heightened ambition and aggression.
Augments were created before humanity's development of warp drive and were notable for instigating the Eugenics Wars in an attempt to take over the world. They were eventually defeated, but a handful escaped into space and became problems for Federation starships in later years. An attempt was made in the 22nd century by a renegade scientist to recreate the Augments from genetic samples.
One of the lasting effects of the Augments was a widespread ban on extensive genetic engineering of sapient life by Terran nations afterwards, a ban that would be continued by the Federation.