Solana is a blockchain project which uses Proof of History (POH) as a way of solving the problem of node synchronization within a blockchain (which slows it down). It creates something like a decentralized clock. It is used in tandem with Proof of Stake (POS). This makes the blockchain more efficient because it can handle more transactions per second
SOL is the cryptoasset of the Solana blockchain. It appears to be deflationary (due to burning). It can be staked, used to run a verifying node and in general transmit value through the blockchain.
489 million SOL were created. The Solana blockchain is extremely fast for processing transactions. It can process 50000 transactions per second (TPS). In order to compare, Visa processes 3000 TPS, Ethereum 15 TPS and Bitcoin 7 TPS