There are three different game modes you can choose from and the one you select will depend on whether you want to play alone or with others in a team.
Solo Deathmatch
Solo Deathmatch mode is a huge free-for-all where all 120 players face off against each other with the goal of being the last man or woman standing at the end.
Duos
Duos mode is basically the same as Solo Deathmatch mode except all the participants will have a partner and the loot is shared between both players, this means when you loot you need to make sure you always leave something behind for your partner to pick up.
Squads
Squads mode is the same as Duos mode but instead of two players per team there can be up to a total of four. If you are able to coordinate with friends you will have an advantage in Duo and Squads modes over those who team up with randoms. As with Duos mode loot is shared between the team in Squads mode.