The Lightning Network (LN for short, or simply “Lightning”) is a decentralized system for instant, high-volume micropayments that prevents users from delegating custody of funds to trusted third parties. It is a layer-2 protocol — a computer network built on top of the Bitcoin base layer (layer 1), the actual blockchain. The Lightning Network uses the Bitcoin base layer’s high protection standards to secure the network.
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Source: Cryptocurrency - investing.com