The Affidavit of Support is a legal contract between you (the petitioner for an immigrant visa applicant) and the US Government. It ensures that the visa applicant has adequate means of financial support and is unlikely to become a public charge after entering the US.
If you have received notification from the NVC to complete an Affidavit of Support for a family-member or an employee to become a legal immigrant to the US, please refer to the Affidavit of Support Instructions.
If you have not been requested by the NVC to complete an Affidavit of Support it may be because: