An exact copy is a reproduction of an original object or document that is identical in every detail. The term can be used to describe a variety of objects, including replicas, duplicates, clones, facsimiles, twins, and mirror images. Replicas are exact copies of an original object, while duplicates are two or more identical copies of the same thing. Clones are exact copies of living organisms, while facsimiles are exact copies of documents or other printed materials. Twins are two individuals who share the same genetic material, and mirror images are exact reflections of an object or image.