This is a horizontal bar chart displaying the population of 20 countries in 2010. The chart uses a light green for bars and blue axis ticks, rendering as an SVG within a React application that leverages the d3.v5 library for data processing and scaling. The bars are created via a `Marks` component that maps data to `rect` elements, with axes built by `AxisBottom` and `AxisLeft`. Population values are formatted using D3's `format` function, converting large numbers to a compact "B" suffix. Data is loaded from a CSV file hosted on GitHub.