An interactive bar chart displays global sales figures for ten video games and programming languages, with hover highlighting that reveals the percentage difference between the selected bar and all others. Built with React and D3 v5, the visualization uses SVG rendering and transitions to animate bar opacity and width changes on mouse events. D3 scales (`scaleBand`, `scaleLinear`) drive the axes, while grid lines and axis generators (`d3.axisLeft`, `d3.axisBottom`) structure the layout. A dashed horizontal line and divergence labels appear on hover, with data sourced from a hardcoded sample array containing names, sales values, and colors.