A dev platform where you can play games and make games (PC and Mac users can only make games while mobile can't) It's currency is called ROBUX or Robux. There was another currency called Tix, It is now discontinued due to easily exploiting it by botting your own game and making Roblox hats inflate in price. Roblox users can customize avatars too. Usually, a starter to roblox (most of them usually 7 or 8) don't know how to play a game or make one.
A game for kids that censors everything and forces you to pay money or you will be called noob and be insulted and also people here don't know what noob means so here is the definition. Noob: A new player or someone new to something