An Affidavit Witness Statement is a legally-binding document that acts as a written declaration of truth. It is an sworn statement made by a witness under oath in a court of law or other legal proceeding, containing facts that the witness has personal knowledge of and believes to be true. The statement must be given in the presence of an authorized person such as a lawyer or notary public, who will then certify the document and swear to its validity. Affidavit Witness Statements are used as evidence in civil and criminal cases, and can provide vital information to help determine a case outcome.