But what is evidence and how can it be weighed and introduced? Ia a broad sense, evidence is anything perceptible by the five senses and any species of proof-such as testimony of witnesses, records, documents, facts, data, or concrete objects-legally presented at a trial to prove a contention and induce a belief in the minds of the court or jury. In weighing evidence, the court or jury may consider such things as the demeanor of witnesses, their bias for or against an accused, and any relationship to the accused. Thus, evidence can be testimonial, circumstantial, demonstrative, inferential, and even theoretical when given by a qualified expert. Evidence is simply any thing that proves or disproves any matter in question.