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. 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 serve various purposes, such as supporting a lawsuit, verifying a person's identity, or providing evidence in family law cases. They are important because they help establish credibility and can be used to support claims or defenses in legal matters.