This bar chart displays the populations of the top 20 countries in 2010, using horizontal bars and a logarithmic-like axis format that abbreviates large numbers (e.g., "B" for billions). Rendered as an SVG in React, the visualization uses D3 v5 modules such as `scaleBand` for the categorical y-axis and `scaleLinear` for the x-axis, with a tooltip on each bar showing the exact value. Data is loaded from a CSV via D3’s `csv` function.