What is the difference between real evidence and demonstrative evidence?

Answer 1

By "real evidence" I assume you mean evidence given by a witness verbally under oath on the witness stand. That is called testimonial evidence. In any event there are two types of evidence. One is testimonial evidence and one is demonstrative evidence. Testimonial evidence is simply evidence given by a person testifying verbally under oath or affirmation. Demonstrative evidence is taken from inanimate objects that demonstrate some particular fact. In a typical Law and Order episode the witness who testifies he saw the defendant shoot the victim is providing testimonial evidence. Exhibit A, the murder weapon with the defendant's fingerprints on it is demonstrative evidence, because it demonstrates that the defendant had the weapon in his hand. Both are real evidence as the defendant will shortly be very unhappy to learn.