This example visualizes the relative heights of six products as a horizontal bar chart, with each bar’s length encoding the numeric value from `data.json`. The visualization uses D3’s `select` to manage the DOM, while `d3.json` loads the dataset asynchronously and logs it to the console. Black, thick lines with rounded joins and caps are styled via the `.lines` class, and hovering or selection can trigger a blue highlight effect, though the interactive behavior is not fully implemented in the shown code.