An Affidavit is a sworn statement made before a notary public which explains to the court why your request should be granted. Affidavit definition: .After the Affidavit of Service is done, it must be filed with the Court. An affidavit is a statement made under oath, claiming that a fact or set of facts is true to the best of the "affiant's" knowledge. An affidavit is the written equivalent of verballygiven court testimony. 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. Learn how to use and draft affidavit forms with this comprehensive guide.