Eth 2.0 Staking involves locking up Ethereum (ETH) in the Ethereum 2.0 network to support its transition from a proof-of-work (PoW) to a proof-of-stake (PoS) consensus mechanism. Key features include earning rewards for validating transactions, enhancing network security, and contributing to scalability. Unique aspects include the requirement of a minimum of 32 ETH to become a validator and the multi-phase upgrade process designed to improve the Ethereum blockchain's efficiency and sustainability.