A pie chart visualizes the top 10 countries by reported COVID-19 cases, with each slice colored and labeled via an adjacent legend. The chart uses D3 v5 to load CSV data, compute arc paths with `d3.arc()`, and render SVG elements. Colors are assigned through `d3.scaleOrdinal`, while numeric values are formatted with `d3.format`. The legend pairs colored rectangles with country names and abbreviated case counts, all positioned within an SVG canvas.