What is the difference between Chainlink and Solana?

Could you elaborate on the fundamental differences between Chainlink and Solana? I'm particularly interested in understanding how they approach the challenges of integrating blockchain with real-world data and transactions. Chainlink, as I understand, bridges the gap between blockchain and external data sources. On the other hand, Solana seems to focus on high-speed and low-cost transactions. Could you explain the technical nuances of their respective functionalities and how these differences impact their applications and market positioning?