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Real evidence is a thing the existence or characteristics of which are relevant and material.
It is usually a thing that was directly involved in some event in the case. The written contract upon which an action is based is real evidence both to prove its terms and that it was executed by the defendant. If it is written in a faltering and unsteady hand, it may also be relevant to show that the writer was under duress at the time of its execution. To be admissible, real evidence, like all evidence, must be relevant, material, and competent. Establishing these basic prerequisites, and any other special ones that may apply, is called laying a foundation.