A sorted horizontal bar chart compares population counts for ten countries from a CSV file. Bars render in SVG with a green fill, and hovering highlights a bar while a tooltip div shows the country name and population. A click toggles bar color between green and magenta, and the chart calculates and displays a sum of all selected populations in a separate box. The visualization uses d3.scaleBand for the y-axis, d3.scaleLinear for the x-axis, and d3.axisBottom with dashed gridlines. Tooltip and selection logic rely on D3’s `.on('mouseover')`, `.on('mouseout')`, and `.on('click')` event handlers, with transitions animating the color changes.