The employment, craft, or function that a person participates in is called Business. There are two main aspects of business: Commercial and Industrial. Commercial businesses are companies and corporations that contain services and products for the mass market. The service provided by commercial businesses may include marketing, merchandising, and trade. Industries are areas of the economy that creates, builds, or manufactures the goods, services, and products that are traded, bought, or sold withing the world of commerce. Business is also the affairs between professional, commercial, and/or industrial parties.