Intermediate goods are goods which are made part of some final good. For instance, tires are intermediate goods when they are part of a car. Tires are final goods when they are sold separately as replacement parts. Incorporating intermediate goods to form a final good adds value to that good.
Almost all metals and crude oil are part of intermediate goods: they are not counted separately, but as part of the final good in which they are incorporated. Tires purchased by customers to replace used tires are final consumption; but, not the tires installed on new cars: these are intermediate goods.