Intermediate
Layer 2
Also: layer-2, layer 2s, L2, L2s
A network built on top of a blockchain that processes transactions more cheaply and settles back to it.
Layer 2s take work off the main chain, which keeps fees low, and still lean on it for security. Most Ethereum layer 2s are rollupsRollup A layer-2 design that bundles many transactions together and posts the results to the main chain.. Moving funds between a layer 2 and the main chain uses a bridgeBridge A service that moves tokens between blockchains, often by locking them on one chain and issuing copies on another..