What is PoA vs PoS Crypto?

Could you please explain the difference between Proof of Authority (PoA) and Proof of Stake (PoS) consensus mechanisms in the world of cryptocurrency? How do they work differently, and what are the main advantages and disadvantages of each system? As a cryptocurrency enthusiast, I'm particularly interested in understanding the nuances between these two methods and how they impact the overall security, decentralization, and efficiency of blockchain networks.