Ductility is a measure of a material's ability to deform under tensile stress, which means it can be stretched into a wire without breaking. This property is particularly important in metals like Copper and Aluminum, which are often used in electrical wiring and construction due to their ability to be drawn into thin strands. In engineering and manufacturing, ductility is crucial for ensuring that materials can withstand forces without fracturing. Ductile materials can absorb energy and undergo significant deformation, making them safer and more reliable in applications such as Bridges and Buildings where structural integrity is vital.