Ductility is a material's ability to deform under tensile stress without fracturing. It's the ability to be stretched into a thin wire without breaking.

Here are some examples of ductile materials:

* Metals: Gold, silver, copper, aluminum, and iron are all highly ductile.

* Some Polymers: Certain plastics, like polyethylene, can be stretched into thin fibers.

Important Note: Ductility is often confused with malleability. While both describe a material's ability to deform, malleability is the ability to be hammered or pressed into thin sheets without breaking.