Business is the science of managing people to maintain collective productivity toward accomplishing particular creative and productive goals to generate revenue. There are many types of businesses. There are manufactures such as car production companies, clothing companies who produce goods from raw materials. There are service businesses such as contractors, cleaners, entertainers, etc., those who charge for their labor or intangible goods. Retailers or distributors make money through the act of selling goods or distributing products. Companies that generate their profit through investment and management of capital, such as banks are considered financial businesses. There are also government associated businesses which are called utilities. These are usually public services such as sewage, heat and electricity services. A business with an increasingly growing popularity these days is the real estate business. Real estate includes selling, renting and development of property. It has proven to be incredibly profitable.