The blockchain technology has become a cornerstone of modern digital transactions, enabling secure, transparent, and decentralized exchanges of value. At the heart of blockchain's functionality are consensus mechanisms, which ensure all participants agree on the transaction ledger's state without needing a central authority. Two of the most prominent consensus mechanisms are Proof of Work (PoW) and Proof of Stake (PoS). This article explores the intricacies of both systems, comparing their advantages and disadvantages to provide a comprehensive understanding of their roles in the blockchain ecosystem.