Table of Contents for What are the fallback() and receive() functions in Solidity

Receive function in solidity

receive() external payable {
 // .. your logic here
}

• The receive() function was added in Solidity 0.6.0.
• It is used as a fallback function when eth is sent to a smart contract
• It is used only when there is ether sent to a smart contract, and no calldata was sent.
• (if call data was sent, it will fall back to fallback())

Fallback function in Solidity

fallback() external payable {
 // .. your logic here
}

• If you call a function that does not exist on a smart contract (from another contract), then it will attempt to run the fallback function (if it was defined).

Further reading

https://ethereum.stackexchange.com/questions/81994/what-is-the-receive-keyword-in-solidity

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