Fortnite is an online multiplayer battle royale and survival shooter game developed by Epic Games, first released in 2017. It has three main game modes:

1. Fortnite: Save the World: This is a cooperative survival mode where players work together to fight waves of monsters and build defensive structures. The focus is on survival and strategy.
2. Fortnite Battle Royale: The most popular mode, where 100 players compete against each other on a large island, with the goal of being the last one standing. Players can find weapons, build structures to defend themselves, and eliminate opponents.
3. Fortnite Creative: This mode allows players to create their own worlds and games, which they can share with the community.

Fortnite is known for its vibrant, cartoon-like graphics, fast-paced gameplay, the ability to build structures during combat, and frequent updates with new content and seasonal events. It often features collaborations with major brands like Marvel, Star Wars, and famous musicians, making it a cultural phenomenon.