This Community brief introduces systems thinking as a practical approach for understanding and addressing complex challenges within communities. Using accessible examples, it explains how interconnected elements: such as social, environmental, and economic factors that shape everyday realities, particularly in contexts like informal urban settlements. It outlines key concepts including mental models, feedback loops, the iceberg model, and system archetypes, showing how underlying structures and relationships drive visible problems. Ultimately, the brief emphasizes the value of looking beyond surface issues to identify root causes, enabling more inclusive, collaborative, and long-term solutions for community development.