What does Loopring do?

Could you elaborate on the role and functionality of Loopring in the cryptocurrency and financial landscape? Specifically, how does it facilitate transactions and what are some of its key features? Additionally, how does it differ from other decentralized exchange protocols and what challenges does it aim to address? Furthermore, could you discuss its potential impact on the future of decentralized finance and how it might shape the crypto market? Lastly, are there any notable partnerships or collaborations that Loopring has established to further its mission?