- With MFA, when a user signs in to an AWS
website, they will be prompted for - their user name and password (the first factor—what they know)
 - an authentication response from their AWS MFA device (the second factor—what they have)
 
- Multiple factors provide increased security for AWS account settings and resources.
- Enable MFA for AWS account and for individual IAM users created under account.
- MFA can be also be used to control access to AWS service APIs.
MFA delete
- works on Versioned S3 Buckets
- protects all revisions (including delete markers) from being deleted
- with a corresponding special delete command that includes valid MFA token from authorised user.
- If MFA Delete is enabled, the user will be
prompted for an authentication code for either - Change the versioning state of the bucket
 - Permanently delete an object version
 
- To enable MFA Delete you need to specify MFA serial number.

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