What is two-factor authentication (2FA)?

Two-factor authentication (2FA) is a security process that enhances the protection of user accounts by requiring two different forms of identification before granting access. This method typically involves something the user knows (like a password) and something the user has (such as a mobile device or a hardware token). The use of two separate factors significantly reduces the risk of unauthorized access, even if one factor, like a password, becomes compromised.

This approach is essential for securing sensitive information online, as it adds an additional layer of security that is not available in methods involving only a password. By requiring two distinct types of verification, 2FA makes it much harder for attackers to gain access to a system or account without having both factors.