A testimonial (affidavit) is a written statement made under oath, often used in legal proceedings. It serves as a formal declaration of facts, where the person providing the testimony, known as the affiant, swears that the information is true to the best of their knowledge. This document can be used to support claims or provide evidence in court. Affidavits are commonly utilized in various legal contexts, such as family law, property disputes, and immigration cases. They must be signed in the presence of a notary public or another authorized official to ensure their validity.