Ethereum staking is a process where participants, known as validators, lock up a specific amount of ether (ETH) to support network operations and earn rewards, marking Ethereum's transition from proof of work (PoW) to proof of stake (PoS). This energy-efficient system rewards validators based on the amount of ETH they stake and their performance, while also imposing penalties for misconduct. Additionally, options like staking pools and liquid staking provide flexibility for users with varying resources and expertise.