How does stETH pay rewards?

Could you kindly explain how stETH generates and distributes rewards? I'm particularly interested in understanding the mechanisms behind this process. As a holder of stETH, I'm keen to know how my investment is generating returns. Are these rewards linked to the performance of Ethereum or are they derived from other sources? Additionally, how often are these rewards paid out, and what are the factors that determine the amount of rewards received? I'm looking to gain a deeper understanding of this aspect of stETH so that I can make informed decisions about my investment strategy. Thank you for your assistance in clarifying this matter.