Fortnite is a survival adventure map which is probably made based on the popular game on PS4 with the same name.
Client Version: 1.12
If you watch the trailer, the buildings that are available in this map is similar to the environment in Fortnite PS4 version.
In PS4 Fornite game, all you need to do is collect woods, stones and material by breaking buildings blocks, cars and trees to build fort and fight for survival.
Since this is Minecraft, it’s probably the same but in this map you fight Ai.
It seems that this map supporst minecraft online multiplayer sessions so you can invite your friends to play with you