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This question already has an answer here:

For example, event CoinTransfer(address sender, address receiver, uint amount);

What is the difference between CoinTransfer(msg.sender, receiver, amount); and emit CoinTransfer(msg.sender, receiver, amount);

marked as duplicate by Ismael, Richard Horrocks, shane, flygoing, Achala Dissanayake Nov 14 '18 at 3:10

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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As of Solidity 0.4.21, the emit keyword has been added to explicitly call events.

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