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These are very strong tapes used for holding things together. Gaffer tape has a fabric backing and is designed to be removable; it is often used to tape cables down to avoid trip hazards or to conceal them on stage. Duct tape has a plastic-coated fabric back and is designed to stick permanently: it is used for all sorts of repairs and is waterproof and very durable. The two are similar, are often confused and are interchangeable for many uses.