Quite often these two are confused as the same but they are not and serve different purposes. A wire could be a single strand or bundle of strands for conductive purposes. They could be made of aluminum or copper. However, the cable has two or more conductors that are insulated and twisted together inside a protective outer jacket. A wire harness links wires into a cohesive unit with necessary connections and terminations for completion of the task. While cable harness is also similar to this but differs in the applications.