What does Affidavit mean? The purpose of the Affidavit is to assist consular officers in determining whether a visa applicant will have adequate means of financial support in the US.A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court. A written, sworn statement of evidence. Speed up all aspects of your legal work with tools that help you to work faster and smarter.