The acronym '2FA' stands for two-factor authentication, which is a security measure that requires two forms of verification before granting access to an account or system. Typically, 2FA combines something the user knows (like a password) and something the user has (such as a mobile device for a verification code). This additional layer of security significantly reduces the risk of unauthorized access, as it makes it more difficult for potential attackers to gain entry even if they obtain the user's password.