The Ethereum Merge, completed on September 15, 2022, represents one of blockchain's most significant upgrades, transitioning the network from energy-intensive Proof of Work to efficient Proof of Stake consensus. This transformation reduced Ethereum's energy consumption by over 99%, addressing sustainability concerns while enhancing network security and establishing foundations for future scalability improvements. The upgrade replaced miners with validators who stake ETH, eliminating computational mining and creating stronger economic incentives for honest participation. For regular users and ETH holders, the Merge was seamless—no action required, balances remained safe, and token functionality continued unchanged. Post-Merge upgrades including Shanghai and Cancun further optimized the network, enabling staking rewards and Layer 2 scaling solutions. Today, Ethereum operates as a more sustainable, secure, and scalable platform positioned for continued development and institutional adoption.