What is the largest DEX in the world?

Could you elaborate on the identity of the largest decentralized exchange (DEX) in the world? As the cryptocurrency and finance landscape evolves rapidly, it's crucial to stay updated on the latest developments. Could you provide a brief overview of the DEX you're referring to, including its key features, trading volumes, and market share? Additionally, what sets this DEX apart from its competitors and how does it maintain its leading position in the market? I'm interested in understanding the dynamics and trends that shape the competitive landscape of DEXs.