This bar chart shows the salary of employees across different ages, displaying the top 15 ages in the dataset. The visualization uses React with hooks to manage state, and D3 v5’s `csv` loader to fetch and parse the data from a GitHub gist. Scales are created with `scaleBand` for the y-axis and `scaleLinear` for the x-axis, while axes are rendered manually using `ticks`. The chart is drawn as SVG elements, with blue grid lines and horizontal bars.