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The Light Ethereum Subprotocol (LES) is the Protocol used by “light” client (or 2.3.3.2 Lightweight Node (Wallet)) Nodes, which only download block headers as they appear and fetch other parts of the Consensus Process. Full and Archival nodes can also support the les protocol besides Ethereum Wire Protocol (ETH) in order to be able to serve light nodes.

Source: https://github.com/ethereum/devp2p/blob/master/caps/les.md