This bar chart visualizes the number of migrants per country, with bar heights encoding the values on a linear scale. The chart uses D3 v6 to load CSV data, create band and linear scales, and render SVG axes and rectangles. Interactive mouseover events change bar colors from steel blue to orange, with a smooth transition on mouseout. The data originates from a remote CSV file, and the visualization is built entirely with D3’s selection, scale, and axis APIs.