Making a Bar Chart
This bar chart displays the population of the ten most populous countries, using 2018 estimates from the United Nations World Population Prospects. The chart uses D3 v4 with an SVG rendering approach, employing `scaleLinear` for the population axis and `scaleBand` for the country categories. The visualization demonstrates custom axis formatting with `axisBottom` and `axisLeft`, including tick label conversion from billions to a readable format. Data is loaded from a CSV file using `csv`, and the chart includes styled axes, a title, and an x-axis label through D3's selection and append methods.