This document discusses the components and functions of an information system. An information system is an integrated user-machine system that provides information to support operations, management, analysis and decision-making in an organization. It consists of computer hardware, software, and manual procedures. The key components of an information system include a database, file manager, query administrator, storage manager, and users. An information system supports various management functions across an organization like logistics, marketing, information processing, production, finance, and personnel. It also supports top management functions such as strategic planning, resource allocation, transaction processing, management control, and operational control.