Final answer:
Ductility is the ability of a metal to be stretched into thin wires. Copper is an example of a metal with high ductility, which makes it suitable for use in electrical wiring.
Step-by-step explanation:
Ductility refers to the ability of a metal to be stretched into thin wires without breaking. This property is one of several that characterize metallic solids, which also include being malleable, able to conduct heat and electricity, and having a metallic lustre. In the context of copper wires, which are often used for extension cords and house wiring, ductility is critical because it allows the metal to be formed into long, thin wires necessary for electrical applications. Copper, in particular, is known for having high electrical conductivity, high tensile strength, and high ductility, making it an excellent material for wiring.