\'HORUS HERESY CCG 39 Daemons Fire Boosters\'
\"CCG\" is the standard acronym for Collectible Card Game. \"Booster\" is the standard term in CCGs for a small pack of extra cards (while amounts vary per game, CCGs are often sold in 60-card starter decks and 15-card booster packs).
So yes, it\'s a card game; think of it like a Magic: the Gathering game in the WH40K world. It\'s probably not too apt an analogy, game-wise, as I have no familiarity with the 40K CCG or how it\'s played... but it might be the best one for someone who\'s not even familiar with the term \"CCG\" in the first place.