Fortnite is a multiplayer game were 100 people are dropped on an island and have to shoot each other. Victory in Solo mode is achieved by the last player standing. In Duos or Squads the Last team standing wins.
Richard Bartle's Player Types
This is the Player type Fortnite mostly caters towards since it is a shooter game.
In Fortnite there are limited time cosmetics that one can get during a season. Each item will unlock once a certain goal is reached by the player while playing the game. This could be to get a number of kills, or open a number of chests, etc. Achievers are more likely to buy a battle pass to get the extra achievements that are not available in the free version of the game.
Socializes are more likely to play in Squad mode or Duos so they can talk to and help other people online.
Each Battle Pass comes with a few riddle challenges that one must find within the game map while playing. Explorers are usually the ones who find the most challenging ones first and claim their special prize.