Proof of Stake
Proof of Stake (PoS) is an alternative to PoW (Proof of Work) when you mine new coins. With Proof of Stake you ‘stake‘ your coins in a designated wallet. And those coins then secures the network and keeps it going. With Proof of Stake you get rewarded new coins similar to mining for your participation.
Proof of Stake is a fairly new blockchain model, there are many discussions around which of PoS vs PoW is more efficient, secure and decentralised. Ethereum has announced they will move to a Proof of Stake model in the future.