Multi-factor authentication
MFA · A sign-in method that asks for a second proof, such as a code on your phone or a security key, in addition to the password, so a stolen password alone is not enough.
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Why it matters
Passwords can be stolen through leaks, phishing pages or guessing; multi-factor authentication stops an account being opened with the password alone. It is one of the most effective and cheapest measures, especially for e-mail, admin panels, domain and hosting accounts, and payment services.
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Example
An employee types their e-mail password into a phishing page. When the attacker tries to sign in, a verification request appears on the employee's phone; they do not recognise it, reject it and tell the IT team, and the password is changed at once.
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Common mistake
Relying only on SMS codes, or approving unexpected sign-in prompts without thinking. Where possible use an authenticator app or a security key, and teach staff never to approve a request they did not start.
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Related terms
Related services and guides
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