Two-factor authentication uses two different categories of evidence when verifying access, rather than relying on one password alone. The exact supported method depends on the service. It can strengthen an account's protection, but it does not remove the need to recognise phishing, protect recovery information and use the authentic sign-in route for the account.
A practical example
A reseller panel might support a password plus an authenticator-generated code. If that option is genuinely provided, the owner can protect panel access separately from customers' playback credentials, while keeping the recovery process available in case the usual second factor is lost.
A common misunderstanding
Two passwords are not necessarily two different factors. Never send a current verification code to someone who contacted you unexpectedly, even if they claim that doing so will fix account access.
Related terms
Stable technical definition. Editorial approach