Layer 2 refers to a secondary framework or protocol built on top of a Layer 1 blockchain, designed to improve scalability, transaction speed, and reduce costs without compromising security or decentralization.

Layer 2 solutions aim to handle transactions off the main blockchain (Layer 1) to alleviate congestion and increase efficiency.

Layer 2 protocols work by processing transactions off-chain and only settling the final results on the Layer 1 blockchain, which helps reduce the load on the base layer and makes it possible to handle more transactions per second. Popular Layer 2 solutions include the Lightning Network for Bitcoin and Optimistic Rollups for Ethereum. These solutions maintain the security of Layer 1 while enabling faster and cheaper transactions, making blockchain networks more scalable.

Short example:

Suppose you’re using the Lightning Network, a Layer 2 solution for Bitcoin.

You initiate a transaction, which is processed off-chain by the Lightning Network.

The final transaction details are only recorded on the Bitcoin blockchain once the transaction is complete, making the process faster and less expensive.

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