Which of the following best describes a composite material?

A composite material is best described as a material made from two different materials. Composites take advantage of the unique properties of each constituent material to provide enhanced overall performance that neither material would achieve alone. For example, a common composite is fiberglass, which combines glass fibers and resin to create a strong yet lightweight material used in various applications, from boat hulls to car bodies.

The other options do not accurately capture the essence of composite materials. A single homogenous material would not exhibit the combined properties of different materials; a combination of metals only excludes non-metal components, which are often crucial in composites; and a type of polymer created through addition reactions refers specifically to a category of polymers rather than a broader combination of materials. Thus, the choice highlighting the combination of different materials correctly encompasses the nature of composite materials.