Wrapped Solana (WSOL) is the SPL tokenised version of SOL. It allows native SOL, which is not an SPL token by default, to be used in the token program ecosystem. By wrapping SOL into WSOL, users can interact with DeFi applications, liquidity pools, and smart contracts that require SPL-compliant tokens.

Technically, WSOL is created by depositing SOL into a special token account where the lamport balance is synchronised with the WSOL token balance. This requires the SyncNative instruction, which ensures that any native SOL transferred into the account is reflected as an equivalent amount of WSOL. One SOL corresponds to one WSOL, maintaining a one-to-one relationship at all times.

When users want to unwrap, they close the token account, which automatically transfers the lamports back as native SOL. This seamless wrapping and unwrapping mechanism makes it possible to use SOL in the same way as other SPL tokens, while preserving compatibility with DeFi protocols on Solana.