What is Mev boost in Ethereum?

Can you elaborate on the concept of "Mev boost" in the context of Ethereum? How does it work, and what benefits does it offer to participants in the Ethereum network? Is it a necessary feature for maintaining the network's efficiency and security, or is it more of an optional enhancement? Additionally, what are some potential risks or drawbacks associated with Mev boost, and how can users protect themselves from potential harm?