What is the cost of stETH?

Could you please explain to me what the cost of stETH is? I've heard a lot about it recently in the cryptocurrency sphere, but I'm not entirely sure what determines its price. Is it influenced by market demand and supply like other cryptocurrencies? Or does it have a different pricing mechanism? I'm also curious to know if the cost of stETH fluctuates significantly, and if so, what factors typically cause these fluctuations? Additionally, could you provide any insights into the potential risks associated with investing in stETH? Thank you for your help in clarifying this matter for me.