First revealed back in June at E3 2013, Ubisoft did not announce the PC version for The Division, despite the game’s persistent online nature. The PC version was officially announced today, in what Ubisoft claims as they have been “listening to what has been said on the internet.”
From Wikipedia: In the game, a disease that spreads on Black Friday causes the United States to collapse in five days. The player is part of a group called “Strategic Homeland Division (SHD)”, called “Division” for short.
This group was established to combat the threat and do whatever it takes to “save what remains” in a massive multiplayer online situation, putting them against friends, AI, and other players.