TOTP 2FA (Time-based One-Time Password Two-Factor Authentication) is a security mechanism that adds an extra layer of protection to user accounts. It works by generating a unique, temporary code based on the current time and a shared secret key. Users must enter this code, usually generated by an authenticator app, in addition to their regular password when logging in. Since the code changes every 30 seconds and is not reusable, it significantly reduces the risk of unauthorized access even if a password is compromised. TOTP 2FA is widely supported and helps protect against phishing, brute-force attacks, and credential theft.