1.9 What is Evidence? Evidence is a type of information that is used in legal proceedings to prove facts or to establish truth. It can be physical, documentary, testimonial, or demonstrative. Physical evidence is tangible objects that can be used to prove a fact, such as a weapon used in a crime. Documentary evidence includes written documents, records, testimonies, or photographs that can be used to support a claim. Testimonial evidence is testimony given by a witness under oath in court. Demonstrative evidence is anything that helps to illustrate a point, such as a model or a diagram.