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Understand 2FA before you depend on it.
Short, practical explanations that lead to the right next action: setup, recovery, tools, or safer authentication choices.
What Is 2FA?
A plain-English explanation of two-factor authentication, why platforms ask for it, and what it can and cannot protect.
Understand how authenticator app codes work.What Is TOTP?
Learn how time-based one-time passwords use a shared secret and clock window to generate changing 2FA codes.
Explain the visible code users enter during login.What Is a 2FA Code?
Understand 6-digit and 8-digit 2FA codes, why they expire, and why a correct code can still fail.
Understand the sensitive value behind TOTP codes.What Is a 2FA Secret Key?
Learn why the secret key behind an authenticator QR code is sensitive and how to handle manual setup keys safely.
Clarify one-time password standards and why this site focuses on TOTP.TOTP vs HOTP
Compare time-based and counter-based one-time passwords and why most authenticator app setups use TOTP.
Educate users choosing a second factor method.SMS 2FA vs Authenticator App
Learn why authenticator apps are usually stronger than SMS and where each method still fits.
Evaluate the risk of using web-based TOTP tools.Is an Online 2FA Generator Safe?
Understand when browser-based 2FA tools are useful for testing and when entering a real secret is dangerous.