An information system is any organized combination of people, hardware, software, networks, and policies that collects, manages and disseminates information to support business processes and decision making. There are different types of information systems that support various levels and functions within an organization, including transaction processing systems, knowledge work systems, office automation systems, management information systems, decision support systems, and executive information systems. Businesses invest in information systems to achieve objectives like operational excellence, new products and services, customer intimacy, improved decision making, competitive advantage, and organizational survival.