Vienna has a diversified economy, with government, finance, commerce, and manufacturing each employing a significant share of the city's workers. A number of international organizations have their headquarters in Vienna. They include agencies of the United Nations, housed in the UNO-City complex, and the Organization of Petroleum Exporting Countries (OPEC). Large numbers of tourists visit the city for its musical events, museums, and palaces, and to enjoy its Old World charm.
Light manufacturing predominates in and around the city. Products include processed foods and beverages, leather goods, apparel and textiles, and electric and electronic equipment.
Vienna has long been a chief port on the Danube. The city is served by a modern and efficient system of highways and railways and by an international airport. Local public transportation includes streetcars, buses, and a subway.