A similarity network visualizes life expectancy trends from 2000–2023, where countries are nodes sized by end-year values and colored by region, with edges linking the most correlated time series. Using React and D3 v7, the force-directed layout runs with `d3.forceSimulation`, while edges derive from Pearson correlation calculations across selected year ranges. Interactions include node dragging, pinning via double-click, region-based filtering, and a search tool. Data comes from a parsed CSV with ISO3 country codes, and geographic regions map via the world-countries GeoJSON dataset.