Material Flow Analysis (MFA) is a systematic method used to assess the flow of materials within a specific system, such as a city, industry, or ecosystem. It helps identify how materials are sourced, used, and disposed of, providing insights into resource efficiency and environmental impact. By tracking the movement of materials, MFA can reveal patterns and inefficiencies, guiding decision-makers in optimizing resource use and reducing waste. This analysis is crucial for sustainable development, as it supports the transition towards a circular economy, where materials are reused and recycled rather than discarded.