This information is important for all FORTNITE @ Epic Games (PC) players.
It based on the team that lasts the longest within a game ,the team that is last standing meaning the last to go down will receive the win.
If the game is won, and both teams are still standing, the team that got the most kills will take the win.
If kills are tied and the game is won the last kill of a standing player decides the winner.
If you and your team mate get knocked, your team will be marked as dead and your opponent will be awarded the win if they did survive longer.