An affidavit is a written statement. A person, known as the affiant, swears under oath to the statement's truthfulness.An affidavit is a sworn statement of facts made under oath. These statutes show that a sworn declaration is just as effective as a notarized Affidavit. An affidavit is a written statement in which the signer or "affiant" verifies that the document is true. In contrast, a sworn affidavit is signed in the presence of a notary, making it a more formal declaration. 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. An affidavit is a written statement in which the signer or "affiant" verifies that the document is true. An affidavit is just a written statement of facts from a specific person. That is because an affidavit is a sworn to document, with legal ramifications if made with a knowing falsity.