An affidavit is a written statement made under oath, often used in legal proceedings. It is a way for a person, known as the affiant, to present facts or evidence to a court or other authority. The affiant must sign the document in the presence of a notary public or another authorized official, confirming that the information is true to the best of their knowledge. Affidavits can be used in various situations, such as court cases, property disputes, or financial matters. They serve as a formal way to provide testimony without needing to appear in person, making them an important tool in the legal system.