As a man or woman stranded naked, freezing & starving on a mysterious island, you must hunt, harvest, craft items, grow crops, & build shelters to survive. Use skill and cunning to kill or tame & ride the Dinosaurs & primeval creatures roaming the land, & team up with hundreds of players or play locally!
ARK: Survival Evolved is a "Day Z-a-like" where you face dinosaurs and other pre-historic creatures instead of the usual zombie hordes. It's playable in single player mode as well as online with up to 70 people per server in either PvP or PvE modes.
Currently available in Early Access for PC via Steam, with release dates for Xbox One and Playstation 4 TBD.
The Steam ARK forum is the current "official" forum and has a lot of developer participation.
The ARK Reddit is also a good source of information and has some developer presence.
The Official ARK Wiki is endorsed by the developers but content is user submitted. As with any wiki beware of faulty or outdated information.