PoS is still an algorithm, and the purpose is the same as in the proof of work, but the process to reach the goal is quite different. With PoS, there are no miners, but instead we have "validators." PoS relies on trust and the knowledge that all the people who are validating transactions have skin in the game. In PoW, the chances of you solving the proof of work problem depends on how much computing power you have. The biggest sensation in cryptocurrency is the bitcoin.    Visit https://cryptida.com/blog/proof-of-stake/