What is AWS multifactor authentication ?

Definition of AWS multifactor authentication

AWS multifactor authentication (MFA) is training or requires at least two types of validation to secure AWS assets. This is an additional security highlight, accessible through Amazon Identity and Access Management (IAM), which reinforces the user name and secret key certificates.
It is considered a proven practice for the MFA to be used for a root account or for “highly-favored” clients that deal with sensitive assets. It can be used for multi-account access via various AWS accounts. This is useful if your organization has different records and a trusted client must have access to all of them.