What are commodity derivatives?

Could you please elaborate on the concept of commodity derivatives? I'm particularly interested in understanding what they represent, how they operate within the financial markets, and what types of risks are associated with investing in them. Additionally, I'm curious about the role they play in hedging against price fluctuations and how they differ from other financial instruments. Could you provide some examples of commodity derivatives and explain how investors can use them to diversify their portfolios? Thank you for your assistance in clarifying this topic.