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Layer 2 is a secondary framework built on top of a blockchain to enhance scalability and speed.

Layer 2 is a secondary framework or protocol that operates on top of an existing blockchain network. Its primary purpose is to enhance the scalability and transaction speed of the blockchain. By processing transactions off the main chain, Layer 2 solutions like the Lightning Network for Bitcoin or Optimistic Rollups for Ethereum reduce congestion and lower fees. This allows for more efficient and cost-effective transactions. While Layer 1 refers to the base blockchain, Layer 2 provides additional capabilities, making it crucial for mass adoption and usability of blockchain technology.