Is Lido an erc20?

Could you please clarify for me if Lido falls under the category of ERC20? I've been doing some research on cryptocurrencies and their various standards, and I'm a bit confused about this specific one. ERC20 is a technical standard for smart contracts, isn't it? And it's used for tokens on the Ethereum blockchain, right? So, is Lido compliant with this standard? Or does it operate on a different principle? Your insight would be greatly appreciated as I'm trying to broaden my understanding of this rapidly evolving field.