PoS (Point) refers to a method of validating transactions in blockchain networks. It allows users to create new blocks and confirm transactions based on the number of coins they hold and are willing to "stake" as collateral. This system is designed to be more energy-efficient than the traditional PoW (Proof of Work) method, which requires significant computational power. In a PoS system, validators are chosen to create new blocks based on their stake and other factors, such as the age of their coins. This encourages users to hold onto their coins, promoting network stability and security while reducing the environmental impact associated with mining.