WSOL on Arbitrum chain is a bridged version of SOL. SOL is the native currency of the Solana chain used for gas fees and security.
WSOL is a large-cap, fully collateralized asset. This asset is exposed to the underlying risks of Portal (Wormhole) bridge, a protocol rated as Watch out.
WSOL has an uncapped supply but has inflation control or burn mechanisms in place. WSOL on Arbitrum is backed 1:1 by SOL locked in the Portal bridge protocol on the Solana chain.