If the asset you deposit is available for borrowing, you earn interest depending on how much the asset pool is utilised. The more utilised a pool is, the higher the interest rate earned by the lenders to the pool. You can also use your deposited assets as collateral to fund your own borrowing from the protocol. Additionally, you are rewarded with INV tokens for depositing certain assets (regardless of utilisation ratio or whether their borrow market is open or not)