Layer 2 solutions are essential in scaling blockchain networks, particularly Ethereum, by offloading transactions from the main chain (Layer 1) to improve speed and reduce costs. These solutions, like Optimistic Rollups and zk-Rollups, enable higher transaction throughput and lower fees while maintaining the security and decentralization of the main blockchain. As blockchain adoption grows, Layer 2 technologies play a critical role in making blockchain applications more practical and accessible.