This visualization presents a comparative view of the global COVID-19 pandemic through two side-by-side choropleth maps. One map displays the monthly incidence rate of new COVID-19 cases per 100,000 inhabitants, using a red sequential color scale, while the other shows the vaccination rate using a green scale. Both maps feature a play button and a draggable slider to animate through time from January 2020 to May 2021. The geographic data is rendered using the `d3.geoPath` projection with Natural Earth and TopoJSON, and the temporal data is sourced from Our World in Data.