Second, they have to confirm their identity by providing additional information that can only be accessed by them, for example, a confirmation call, SMS code, USB key, fingerprint, face image, etc. With two-factor authentication, first, a user has to enter information that only they know. Multi-factor authentication (MFA) is a method to confirm the identity of a user by requiring multiple credentials before authorization and before providing access to a website, application or other resources. This blog post explains what multi-factor authentication is, and how to use it in Office 365 and Office 365 app passwords. Some companies use multi-factor authentication by default in accordance with their security policy. If a single password meeting Office 365 password requirements is not enough to protect your account or accounts of users in your organization, consider using multi-factor authentication, which is supported by Microsoft Office 365. Add to that software vulnerabilities and user resilience to social engineering tricks and phishing attacks. However, the security of an account is only as strong as its password. Using a username and a password as login is a classic method of authentication.
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