The way Lido is architectured makes stETH a fantastic piece of DeFi-lego, letting you use it as you normally would use your Ethereum. The benefit? Your stETH balance increases daily as staking rewards come in.
The most popular way of utilizing stETH right now is by providing liquidity on the ETH/stETH-pool on Curve. You can also use stETH as collateral to take out a loan on Aave. In the future, more integrations will come with further use cases for stETH.
For a full overview of what you can do with your stETH, check the following resources: