They are written plainly, for an audience with no legal experience, and are easy to understand. 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.After the Affidavit of Service is done, it must be filed with the Court. An affidavit is a written statement made under oath that is typically used in legal proceedings. Learn their purpose, when to use, and how to write. The following forms are available for downloading, printing and completing. Search the County Assumed Names records for availability of the name of the business. It is always best to search all variations of the business name. An affidavit is a self-serving declaration used in legal service. Consider it sort of like a confession, or a witness statement.