The document defines a system as an orderly grouping of interdependent components linked together according to a plan to achieve a specific objective. It provides examples of computer systems, hotel systems, and business systems. It describes the key elements of a system as including organization, interaction, and interdependence between components, as well as integration and a central objective. Systems have structure and order to help achieve their goals, and components function interdependently, like departments in a business. A system's parts depend on one another, with the output of one subsystem becoming the required input of another to achieve the overall goal of the system.