What makes uniswap a decentralized exchange?

Could you elaborate on the key factors that contribute to Uniswap's classification as a decentralized exchange? I'm particularly interested in understanding the technical and operational aspects that set it apart from traditional, centralized exchanges. What role does its automated liquidity protocol play? How does the decentralized governance structure ensure fairness and transparency? Additionally, how does the platform's open-source nature promote innovation and trustworthiness? I'd appreciate a concise yet comprehensive explanation that highlights the unique features and advantages of Uniswap as a decentralized exchange.