What are Star Coins in Star stable online?

Could you elaborate on the concept of "Star Coins" in the context of Star Stable Online? As a player, I'm curious about their function and significance in the game. Are they a form of currency? If so, how can they be acquired? Do they play a vital role in progressing through the game or enhancing my character's abilities? I'd appreciate a concise yet comprehensive explanation of Star Coins and their role in the Star Stable Online universe.