System dynamics is a method used to understand and model complex systems over time. It focuses on the interactions between different components within a system, such as feedback loops and time delays, to analyze how these interactions influence behavior and outcomes. This approach is often applied in fields like economics, environmental science, and public health. By using simulations and graphical representations, system dynamics helps identify patterns and potential problems within a system. It allows researchers and decision-makers to test various scenarios and strategies, ultimately leading to better-informed choices and improved system performance.