In the Bitcoin script, OP_RETURN is an opcode that allows users to embed data into transactions that are stored on the blockchain. It is commonly used to attach metadata or additional information to a transaction without transferring any actual Bitcoin value.

When OP_RETURN is used, the data that follows it is considered as "push data" and is included in the transaction's outputs. This data is typically in the form of hexadecimal values or ASCII text. However, there is a size limitation for OP_RETURN data, and it varies depending on the Bitcoin network consensus rules.

OP_RETURN is often utilized for various purposes such as timestamping, proof of existence, or attaching additional data to transactions. It enables the blockchain to be used as a decentralized and immutable storage medium for a wide range of applications beyond simple transactions.

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