How does two-factor authentication enhance security?

Two-factor authentication is important because it adds an extra layer of security to the standard username and password method of online identification. It requires users to provide two different types of factors to verify their identity, typically something they know (like a password) and something they have (like a code sent to their phone). This additional layer of security makes it much harder for unauthorized individuals to access an account, as even if they have the password, they would also need access to the second factor. This helps protect against various security threats, such as phishing attacks, password leaks, and unauthorized access attempts.