What is 500 satoshi worth?

Could you please explain, in simple terms, what the value of 500 satoshi is? I understand that satoshi is a unit of Bitcoin, but I'm not entirely clear on how much that translates to in terms of real-world currency. Could you help me understand the current exchange rate and how it might fluctuate over time? Also, what factors typically influence the value of Bitcoin and its satoshi units? Thank you for your assistance.