Blackout is a battle royale game mode. The last person (or team) standing wins the game.
Survive to the end as the play space gets smaller and smaller over time. We call this the collapse. The collapse forces players and teams into increasingly smaller play spaces, thus creating intense battles.
Always remember, the game is not over if a teammate is eliminated. Keep fighting until the bitter (or bitter-sweet) end.
You have one life and will not respawn, so make it count.