**3. Information systems**

An information system is specifically designed to operate on information, i.e., information is the flow variable in the system. In general, systems are designed for a purpose and have the following operational properties:


A system can be defined as a combination of hardware, software, infrastructure, and trained personnel operating to achieve specified mission objectives. This definition of system includes both the communications technology and information that is employed in addition to the way in which people interact with the technology.

Modern information systems increasingly rely on globally sourced ICT components and services. The variety and abundance in the marketplace is driven by the rapid decline in cost and the rapid increase in performance advancements. As supply is able to meet the demand for low cost and more functions, today's information systems are increasingly complex in nature.
