Lightning Network
A second-layer payment network built on Bitcoin that enables faster, lower-cost transactions by settling most activity off-chain.
The Lightning Network is a layer 2 system for Bitcoin payments. Instead of recording every small transaction directly on the Bitcoin blockchain, users open payment channels and exchange signed updates between themselves. Only the opening and closing of a channel usually need to be settled on-chain, while the in-between payments happen off-chain and can be routed through other participants in the network.
It matters because Bitcoin’s base layer prioritizes security and decentralization, which limits how many transactions it can process quickly. Lightning is used for smaller, frequent payments where waiting for block confirmations or paying higher fees would be inconvenient, such as buying coffee, tipping online, or sending a small cross-border payment. A useful comparison is a bar tab: rather than paying the cashier after every drink, you keep a running balance and settle the final amount later. Lightning can make payments faster and cheaper, but users still need compatible wallets and liquidity in payment channels.
Other terms in Bitcoin
ASIC
A specialized computer chip built to do one task very efficiently, commonly used in Bitcoin mining to perform hashing calculations.
BTC
The ticker symbol for bitcoin, the native currency of the Bitcoin network.
Bitcoin
A decentralized digital currency and payment network that lets people send value without relying on a bank or central authority.
Block Height
A block height is the number that shows a block’s position in a blockchain, counted from the first block.