Proof-of-stake (PoS) is a way to make sure that transactions on a blockchain are valid. In a PoS system, people who own cryptocurrency can “stake” their coins. This means that they lock up their coins for a certain period of time. In return, they are chosen at random to verify transactions and earn rewards.
PoS is a more energy-efficient and scalable way to verify transactions than the proof-of-work (PoW) system used by Bitcoin. PoW requires miners to solve complex mathematical problems in order to verify transactions. This process consumes a lot of energy and can be slow. PoS, on the other hand, does not require any mining. People who stake their coins are chosen at random to verify transactions. This makes PoS more energy-efficient and scalable.