What is the difference between WBTC and BTC?

Could you please elaborate on the fundamental differences between Wrapped Bitcoin (WBTC) and Bitcoin (BTC)? I'm particularly interested in understanding how their functionalities, use cases, and the underlying technologies diverge. Additionally, could you explain the role of Wrapped Bitcoin in bridging the gap between traditional finance and the decentralized world of cryptocurrencies? I'm keen to grasp the significance of this innovation and how it impacts the broader cryptocurrency ecosystem. Thank you for your insights.