What is the difference between SOL and Solana?

Excuse me, could you please clarify something for me? I've heard about SOL and Solana in the context of cryptocurrencies, but I'm a bit confused about the difference between them. Are they the same thing, or are they two distinct concepts? If they're different, could you elaborate on the key distinctions between SOL and Solana? I'm particularly interested in understanding their functionalities, uses, and any potential advantages or disadvantages they might have. Thank you for your help!