An affidavit is the written equivalent of oral evidence under oath by the "deponent", a person who makes the affidavit. It is a written description of facts that is sworn or solemnly declared to be true, to the best of the deponent’s knowledge. An affidavit is usually related to court proceedings. Hearsay evidence is allowed, as long as the source of the deponent's information is identified, and the deponent takes an oath that he/she believes the evidence to be true. The commissioner’s signature on the document confirms that the oath or affirmation was properly administered, followed by the signature of the deponent, succeeding the oath taken by the latter. A notary public or another officer of the court may also administer oaths or affirmations and similarly sign in confirmation.