This visualization shows international migration by age and sex as a bar chart, with categories on the x-axis and values on the y-axis. The React component loads CSV data from a GitHub gist using d3.csv, then renders an SVG with d3.scaleBand and d3.scaleLinear for the axes. It uses d3.axisBottom and d3.axisLeft to display ticks, while the bars are drawn as SVG rectangles with a steelblue fill. The code explicitly imports d3 functions via ES6 modules and leverages React hooks (useState, useEffect) for data fetching and state management.