Proof-of-Stake (PoS) is a consensus algorithm that is used to confirm or create new blocks in the blockchain.
When using PoS, randomly selected validators leave some of their tokens as collateral (stake) to be allowed to form and validate blocks of transactions. If the block is successfully added to the chain, the validator receives a reward.
The larger the size of the validator’s stake, the more likely its node will be selected in the next validation cycle.
The PoS algorithm is less energy-intensive than the PoW algorithm used in mining.