In this seminar of the POPNET Connects series, Jolien Cremers, Senior Advisor at the Data Science Lab at Statistics Denmark, will discuss the creation of a registry-based, multi-layer, and temporal network of the entire Danish population from 2008-2021, covering approximately 7.2 million individuals. The network maps relationships formed through family, households, workplaces, and schools, providing insights into how social connections influence various aspects of life, such as career trajectories and health. Cremers will also explore how connections reappear across different life stages, reflect one's position in the income distribution, and reveal patterns in shortest path lengths between individuals, offering a novel approach to understanding societal dynamics.