How Do Layer 2 Solutions, like the Lightning Network, Aim to Reduce Transaction Fees?
Layer 2 solutions move the majority of transactions off the main blockchain (Layer 1) and onto a secondary layer. For example, the Lightning Network allows users to open payment channels and conduct numerous transactions off-chain, only broadcasting the final net result to the main chain.
This drastically reduces the number of on-chain transactions, alleviating congestion and lowering fees.