I love Overwatch, Its a video game that was released on May 2016 for Windows, PlayStation 4, and Xbox One in case you didnt know. 
That's cool! How is it played?
Well basically the game assigns players into two teams of six, with each of the players selecting from over 20 characters, known as "heroes", each with a unique style of play, whose roles are divided into four general categories: Offense, Defense, Tank, and Support.
So it's like League of Legends then?
Not really, But I see why you might think it, Overwatch is a first person shooter and is fast action and its important to pick the right hero for the game. 
It sounds like a game I might like. Is is pretty competative?
team work together to secure and defend control points on a map or escort a payload across the map in a limited amount of time. Players gain cosmetic rewards that do not affect gameplay, such as character skins and victory poses, as they play the game. The game was initially launched with casual play, with a competitive ranked mode, various 'arcade' game modes, and a player-customizable server browser subsequently included following its release. Additionally, Blizzard has added new characters, maps, and game modes post-
Overwatch (video game)
Overwatch is a team-based multiplayer first-person shooter developed and published by Blizzard Entertainment and released on May 24, 2016, for PlayStation 4, Xbox One, and Windows. Described as a "hero shooter," "Overwatch" assigns players into two teams of six, with each player selecting from a roster of over 30 characters, known as "heroes," each with a unique style of play that is divided into three general roles that fit their purpose. Players on a