What is the Lido 10% fee?

Could you please explain what the Lido 10% fee refers to? I've heard about it in the context of cryptocurrency staking but I'm not entirely sure what it means or how it works. Is it a commission charged by the Lido platform for providing staking services? Or is it something else? Could you elaborate on the purpose of this fee and how it impacts stakers? Also, is this fee applicable to all staking activities on the Lido platform, or are there exceptions? Thank you for clarifying this matter for me.