Here’s the answer to when you asked what is a lightning node

A Lightning node is a fundamental component of the Lightning Network, a second-layer scaling solution for the Bitcoin blockchain. The Lightning Network is designed to address some of the scalability and efficiency limitations of the Bitcoin network.

A Lightning node is essentially a computer or device running specialized software that enables users to participate in the Lightning Network. It functions as a hub for routing and facilitating off-chain Bitcoin transactions. Lightning nodes establish payment channels with other nodes, allowing users to transact directly and quickly without relying on the Bitcoin blockchain for every transaction.

By using payment channels and smart contracts, the Lightning Network enables faster and cheaper transactions with reduced congestion on the Bitcoin blockchain. Lightning nodes play a crucial role in facilitating these instantaneous and low-cost transactions by relaying payments, maintaining channel balances, and helping to route payments across the network.