What was special about the galleon?

I'm curious, what was it about the galleon that set it apart from other ships of its time? Was it its size, its speed, its armaments, or perhaps its unique design? I'm eager to learn more about the distinctive features that made the galleon a formidable vessel on the high seas. Did it play a significant role in maritime history, and if so, how? I'm intrigued by the story of this historic ship and I'm looking forward to your insights.