What is the Euler Finance?

Can you elaborate on what Euler Finance exactly is? I've heard about it in the context of decentralized finance and blockchain technology, but I'm not entirely clear on its function and purpose. Is it a protocol, a platform, or a specific service? How does it differ from other DeFi projects, and what sets it apart? Additionally, what are the key features and benefits of Euler Finance that make it attractive to users and investors in the cryptocurrency space?