How does Rocketpool work?

Could you please explain, in layman's terms, how does Rocketpool actually function? I've heard it's a staking pool for Ethereum, but I'm not quite sure about the intricacies of its operation. How does it enable individuals to participate in staking without having to run their own nodes? What are the key components and processes involved in Rocketpool's staking mechanism? Is it secure and reliable for users to trust their ETH staking to this platform?