Proof of Stake
Proof of Stake is a system where validators secure the blockchain by locking up (staking) their coins instead of using energy heavy mining.
Quick Reference:
Staking Coins. Low Energy Consumption. Earn not Win.
Expanded Explanation:
Instead of racing with computing power, POS chooses validators based on how many coins they have staked. If a validator acts dishonestly, their staked coins can be slashed (lost). This system is much more energy efficient that Proof of Work, making it popular for modern blockchains. Ethereum switched from Proof of Work to Proof of Stake in 2022 in an upgrade known as “The Merge.” Many other blockchains were built on Proof of Stake from the start.