Proof of work and proof of stake are the two predominant consensus mechanisms used to verify new blockchain transactions, record them on the blockchain’s ledger, and generate new cryptocurrency tokens.
Proof of work requires the “mining” of cryptocurrency, whereas proof of stake utilizes locked or staked tokens to achieve consensus and verify transactions.
https://www.coinbase.com/learn/crypto-basics/proof-of-work-pow-vs-proof-of-stake-pos-what-is-the-difference
Proof of stake vs proof of work: What you need to know | Fidelity