How exactly does downloading/game keys work for Rust?

Just recently discovered this game via some friends and I’m curious whether this is a free game aside from the obvious of needing a key to unlock (purchase) the game? Other than that is this something that requires a steam account or can it be played by just a basic download or with the browser? One last thing, compared to other games such as Minecraft, does Rust require I higher or lower graphics card and efficient computer in regards to how well it can play?

Any answers will be greatly appreciated, and I do apologize if this is in the wrong place or asking some very stupid questions with answers only a moron wouldn’t see at first.

Read the sticky please.

shhhh! go check out announcement! they are coming!!!