An affidavit is a document commonly used in legal proceedings and is similar to a written oath or statutory declaration.
Affidavits are either sworn or affirmed by the deponent (the person declaring the information in the affidavit to be true) and are used as evidence in proceedings though typically only in interlocutory proceedings. There are strict rules about how the content, ie the evidence, can be expressed without being objectionable by the opposing party or criticism by the residing judge.
Affidavits adopt the court proceeding “header” to identify the proceeding it is relevant to.
An example of an affidavit can be found by clicking here (coming shortly).