Non-Metallic Sheathed Cable, often referred to as NM cable, is a type of electrical wiring commonly used in residential buildings. It consists of two or more insulated conductors, typically made of copper or aluminum, surrounded by a non-metallic sheath, usually made of plastic. This design provides protection against moisture and physical damage while allowing for flexibility during installation. The most common form of NM cable is Romex, which is widely used for indoor wiring in homes. It is suitable for various applications, including lighting and power circuits, and is valued for its ease of installation and cost-effectiveness compared to other wiring types.