Information systems are computer applications to support the operations of an organization: the operation, installation, and maintenance of computers, software, and data. Management Information System is the key sectors that emphasizes personal and financial management. Sales Information System is a system to organize information that a series of procedures and methods designed to generate, analyze, disseminate and obtain information to support decision making about the sale.

Other definitions
Information System is a set of hardware, software, brainware, or the rules and procedures that are integral to organized the data into information useful for solving problems and making decisions.

Information System is a result of data processing that is integrated and complement each other, which generates output in the form of images, voice and writing.

Information system is a set of components of the system that has a relation between the components with other components, which aims to produce an information in a particular field. In the classification system needs the information flow chart information, this is the need for a diversity of information by the user information. Criteria of information systems, among others, flexible, effective and efficient.

The system is the collection of information between sub-sub-system related salaing that form a component which includes the input-process-output-related pengolaan information (data that has been so dioleh more useful for users)

An information system (SI) or information system (IS) is aransemen of people, data, processes, and inter-face that interact to support and improve some day-to-day operations in a business, including support to solve problems and the needs of decision-maker manejemen and the user experience in the field