A Stock and Flow Diagram is a visual representation used in systems thinking to illustrate the relationships between different components in a system. It consists of two main elements: stocks, which are quantities that accumulate over time, and flows, which are the rates at which stocks change. For example, in a simple economic model, the stock could represent the total amount of money in a bank, while the flow could represent deposits and withdrawals. These diagrams help in understanding how systems behave over time by showing how stocks are influenced by flows. They can be applied in various fields, including economics, ecology, and project management, to analyze dynamic systems and predict future behavior. By visualizing these interactions, stakeholders can make informed decisions and identify potential areas for improvement.