Definition
Ductility is a material's ability to be stretched into a wire without breaking. Think of copper, which is used to make electrical wires because it can be drawn out so thinly. It measures how much something can deform under tensile stress, which is pulling force. A material high in ductility can be hammered thin or drawn into wires. Unlike brittleness, ductility allows for significant deformation before fracture. It's a key property in engineering and manufacturing.