Is Solana a L2?

I'm curious, is Solana considered a Layer 2 solution? It's been gaining a lot of attention in the cryptocurrency space, and I've heard people compare it to other Layer 2 scaling solutions like Polygon and Optimism. However, I'm not entirely sure if Solana fits into that category or if it's more accurately described as a standalone blockchain with its own unique features and capabilities. Can you help me clarify this?