Steam keys are meant to be a convenient tool for game developers to sell their game on other stores and at retail. Steam keys are free and can be activated by customers on Steam to grant a license to a product.What is a Steam key?
A Steam key is a tool that developers use to distribute their game. It’s a promotional tool (but developers are free to use it however they like), that can be used to share a copy (release or pre-release) of their game. The key allows users to install the game without purchasing it.