The occupations which produce finished goods by using the products of primary activities as raw materials are included in secondary activity. Manufacturing of cloth from cotton, sugar from sugarcane and steel from iron ore are important examples of secondary activities. All these are secondary activities because the final product is to be produced not by nature but has to be made by men and therefore, some process of manufacturing is essential. Let us take an example of cloth. Though the primary product, i.e., cotton is produced by nature, but it cannot be used directly by us in . this form. So to convert it into usable form some process of manufacturing is essential. This can be done in a factory or at home with simple tools.