Multi-Factor Authentication - security method requiring two or more verification methods. Like needing both a key and fingerprint to open a safe.
Online banking uses MFA by requiring both your password and a text message code to log in.
MFA is a security capability rather than a single standalone cloud product. All major cloud providers support MFA for user sign-in, especially for administrative access. AWS offers MFA through IAM, Azure through Microsoft Entra ID, GCP through Cloud Identity and Google account 2-Step Verification, and OCI through its IAM service.