An interactive multi-line chart shows monthly crime counts across Costa Rican provinces from 2016 to 2019, with a dropdown menu to switch between provinces and a color legend distinguishing years. The visualization uses d3.v5 with scaleTime, scaleLinear, scaleOrdinal, axisBottom, axisLeft, and nest to group data by year, drawing smoothed paths using line and curveBasis. Data comes from Justicia Abierta Costa Rica, rendered as SVG with animated transitions when changing provinces, and includes a color legend created with d3.