What is mSOL?
mSOL is a liquid staking token that you receive when you stake SOL on the Marinade protocol.
The mSOL tokens represent your staked SOL tokens in Marinade's stake pool.
They act as a receipt, allowing you to exchange them later on for your staked SOL and the earned rewards. Meanwhile, you can use mSOL in DeFi while the token's price accrues in value vs. the price of your SOL.
mSOL is a rewards-accruing liquid staking token. This means that after each Solana epoch (2-3 days), its value is recalculated based on the staking rewards earned by the Marinade Stake Pool.