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What is the purpose of a "fallback" function in a smart contract?

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The purpose of a "fallback" function in a smart contract is to handle Ether (or other tokens) that are sent to the contract address without specifying a particular function to call. This function is executed when the contract receives a transaction that does not match any of its specified function signatures. The fallback function can be used to perform actions like logging the transaction, rejecting the funds, or executing default behavior defined by the contract developer.
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