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Recursive Length Prefix (RLP) is a package for encoding an arbitrarily nested array of binary data in Ethereum and is the main encoding method used to serialize objects in Ethereum. In order for the nodes of the Ethereum network to exchange data with each other, they must be in a unified format. Serialization means making the nodes in a unified format. RLP encoding is very straightforward and has the advantage of reducing encoding size and maintaining consistency in bytes.

RLP encoding and decoding rules and examples are available on the Ethereum Wiki.