Is the U.S. dollar accepted in Singapore?

I'm curious, does Singapore accept the U.S. dollar as a form of payment? It's a question that's been lingering in my mind, as I'm planning a trip there soon and want to make sure I'm prepared. After all, it's always convenient to have some foreign currency on hand, just in case. So, can I expect to use my U.S. dollars in Singapore, or should I focus on converting them to Singapore dollars before I go? I'd appreciate any insights you might have on this matter.