Matrix Games Forums

Googled it and all I got were how to redeem the key. NO clue as to what it is.
Thank You

Steam is an online gaming service. Steam keys are serials you use to register a game with them. You get a Steam key when you buy a game on their service. Here we offer free Steam keys for games bought here first. Provided the game is also published through Steanm too.

FAQ,

https://www.matrixgames.com/forums/tm.asp?m=4092711