This bar chart displays the top 10 most populous countries using a horizontal layout, with population values on the x-axis and country names on the y-axis. The chart uses D3 v5 APIs including `scaleLinear`, `scaleBand`, `axisBottom`, and `axisLeft`. The axis is customized by removing the default domain lines and ticks, adding a custom tick format that converts large numbers to abbreviated forms (e.g., G to B), and including axis labels and a title. Data comes from World Population Prospects 2017, loaded from a CSV file.