It's a first person multiplayer-only survival game. There is hunger, thirst, hunting, pvp, resource gathering, exploring, crafting, character customization, and base building. Servers can have hundreds of players at once, or as little as 5-10 people. Depends on preference. Small servers allow you to play slower. It can be pretty hard on big servers because everyone raids other bases and kill each other on sight. There are also lots of modded servers. It's really fun and there is a lot you can do. I have fun playing solo, but it can be even better with friends.