Two-factor authentication (2FA) is a security method that requires two different forms of verification before granting access to an account. It adds an extra layer of protection beyond just a password.
Passwords can be guessed, leaked, or reused across multiple websites. If someone gains access to your password, they can log in immediately—unless additional protection is enabled.
2FA significantly reduces this risk by requiring something you have or something you are in addition to something you know.
A password or PIN.
A phone, hardware security key, or authentication app that generates one-time codes.
Biometric verification such as fingerprint or facial recognition.
Authenticator apps use a method called TOTP (Time-Based One-Time Password). They generate a new 6-digit code every 30 seconds based on:
The server and your device both calculate the same code independently. If they match, access is granted.
A code is sent via text message. Convenient but less secure than app-based methods.
Apps like Google Authenticator generate codes offline. More secure than SMS.
Physical devices that must be inserted or tapped to verify login. Highly secure.
Yes. While no system is perfect, enabling 2FA dramatically reduces the risk of unauthorized access. Even if your password is compromised, attackers would still need the second factor.
Two-factor authentication is one of the simplest and most effective security improvements you can enable. If available, it should always be activated for important accounts.