What is a witness statement? Explain how it is used.

A witness statement is a written statement that documents what the witness said during an interview. It identifies the witness, the incident, and the details and facts disclosed during the interview, and it also includes an attestation clause. The statement should be signed by the witness. Although witness statements are generally not admissible as evidence, they are useful in court for impeaching witnesses who contradict what they previously said, or for refreshing a witness's memory.