An affidavit is a sworn statement of fact that can be used in a variety of legal proceedings, from bankruptcy cases to family and civil litigation matters. Affidavits are normally used in court proceedings or government agencies.Write the case Index Number. 5. In a nutshell, an affidavit is a sworn statement that is documented in writing. This article will serve as your compass, guiding you through the process of crafting a legally sound affidavit. The purpose of the EDIA is to provide a complete and accurate inventory (i.e. Please note that this form MUST be notarized. An affidavit is a written statement in which the signer or "affiant" verifies that the document is true. The notary will confirm the signers' identities, ensure the document is complete, and officially witness the parties sign the affidavit. An affidavit and a letter both provide information, but only an affidavit is acceptable as a sworn, legal document.