Tents are a loot item (meaning they can only be found in ruins and the sorts), and are a buildable.
Buildable info and stats Edit
As a buildable item, tents are fairly straightforward. You right click the item, move the build preview where you want to place it, and place the tent.
As for what they do as a buildable, they're a simple one-room tent with a sliding mesh door of some sort and a small hanging lamp that never runs out of energy and can be toggled with E-to-interact.
Research info Edit
Tents have to be discovered to be used, and the chance of discovering it is pretty low.
They cannot be crafted.
8 colors of tent, which change the tarp and the light inside's colored mode. No alternate sizes available.