Corrosion (from the Latin word corrodere = "to gnaw away") is the reaction of a material with its environment. Corrosion occurs, for example, in metals and causes a measurable change in the material resulting in an impairment of the functionality of the component. The best-known type of corrosion is rusting, i.e. the oxidation of iron. Corrosion resistance is the degree of protection against rusting.