A system is a collection of interconnected components that work together to achieve a specific goal. These components can include people, processes, and technology, and they interact in various ways to produce outputs. For example, a school is a system where teachers, students, and resources collaborate to facilitate learning. System models are simplified representations of these systems, helping to visualize and analyze their structure and behavior. They can take various forms, such as diagrams or mathematical equations, and are used in fields like engineering and computer science to predict how changes in one part of the system affect the whole.