How does curve fi make money?

I'm curious to understand the financial mechanics behind Curve Finance. Can you explain in simple terms how does Curve Fi actually generate revenue or profit? What are the main sources of income for this decentralized exchange and how does it sustain its operations while providing liquidity and trading services for various cryptocurrencies? I'm particularly interested in knowing if there are any fees involved in the transactions and how they contribute to Curve Fi's overall profitability.