A factory or manufacturing plant is an industrial building, or more commonly a complex having several buildings, where workers manufacture goods or operate machines processing one product into another. Most modern factories have large warehouses or warehouse-like facilities that contain heavy equipment used for assembly line production. Typically, factories gather and concentrate resources: laborers, capital and plant.
Factories may either make discrete products or some type of material continuously produced such as chemicals, pulp and paper or refined oil products. Discrete products may range from parts to components and assemblies which are made into final products elsewhere or they may make final products. Factories may start from parts supplied from elsewhere or may make parts from raw materials. Industries making continuous materials, sometimes called process industries, typically use energy, usually heat, electricity or both, to transform raw materials into finished product.