What is multi-factor authentication (MFA), and how does it protect my business?

Multi-factor authentication requires users to verify their identity through two or more methods. This process typically involves a password plus a code sent to a phone or generated by an authenticator app. Even if an attacker steals a user’s password through phishing or a data breach, they cannot access the account without the second factor. MFA is one of the highest-impact, lowest-cost security controls available to small businesses, and most regulatory frameworks require it.