What are events in Solidity and why are they important?

Events are a way for smart contracts to communicate that something has happened on the blockchain. They are stored in the transaction logs and can be accessed by external applications.

Benefits:

• Cost-effective logging mechanism
• Enable dApp frontend notifications
• Facilitate blockchain indexing and searching
• Provide audit trail for contract interactions

contract Token {
    event Transfer(address indexed from, address indexed to, uint256 value);
    
    function transfer(address to, uint256 amount) public {
        // Transfer logic here
        emit Transfer(msg.sender, to, amount);
    }
}