Is ARK Ragnarok free on PC?

Could you please clarify if the game ARK Ragnarok is available for free on personal computers? It's quite a popular title among gamers, and I'm curious if there's a way to play it without making a purchase. If not, could you elaborate on the pricing structure and what it includes? I'm particularly interested in knowing if there are any in-game purchases or expansions that might be necessary for a full experience. Thank you for your time and consideration.