Final answer:
The covert ops division of Overwatch was known as Blackwatch, tasked with secret missions and was a significant part of the game's lore, including characters like Reaper and Genji.
Step-by-step explanation:
The covert ops division of Overwatch was called Blackwatch. This division operated in the shadows and was responsible for carrying out clandestine missions and handling matters that required a more discreet approach compared to Overwatch's public and heroic endeavors. Blackwatch played a pivotal role in the lore of the Overwatch universe, and its operations and members, such as Reaper (formerly known as Gabriel Reyes) and Genji Shimada, have been explored in various cinematics and comics related to the game.