Staking in crypto involves holding and locking up cryptocurrencies to support the operations of a blockchain network and earn rewards. By staking their tokens, users contribute to the security and stability of the network by validating transactions and participating in consensus. In return, stakers receive rewards in the form of additional cryptocurrency tokens. Staking is an alternative to traditional mining that requires significant computing power and energy consumption, and it has become increasingly popular among investors looking to earn passive income and support decentralized networks.