An Applicant Affidavit is a legal form used to provide additional information regarding crimes, negative actions, and applicant selfdisclosures. An affidavit is the written equivalent of verballygiven court testimony.Visa Waiver Program, Fraud Warning, Find a US Embassy or Consulate, Straight Facts on US Visas A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court. The FindLaw Legal Dictionary -- free access to over 8260 definitions of legal terms. Search for a definition or browse our legal glossaries. Form I-134 is a promise to financially support a person applying for a temporary visa to the United States, namely a travel visa or a K-1 fiancé visa. If the student lives in the US, the affidavit of support package can be included with the visa application. What to do when the certificate or document you need for your application cannot be found.