Copper-mylar tape is a type of tape that has a copper foil backing laminated to a polyester film. It is used for various applications such as EMI/RFI shielding, grounding, and electrical conductivity. The copper backing provides excellent conductivity and the polyester film adds strength and durability to the tape. Copper-mylar tape is commonly used in the electronics industry for shielding electronic components and in the automotive industry for shielding wires and cables.