Employment Paperwork Who Is Supposed To Be The "witness" In Employment Paperwork?

Who is supposed to be the "witness" in employment paperwork? - employment paperwork

Recently, I have a new job. I have a folder full of things) must be signed (contract, privacy, control of the police, and any document required the signature of a witness. My employer is said to be the witness? Or it can be assumed that someone with me when I signed? What is expected in this situation? Thank you!