This example visualizes population trends over time for various global regions, with multiple lines displayed simultaneously to facilitate comparison. The data is presented using a line chart, where each line represents a different region and is color-coded according to a categorical scheme. The visualization is built using React and D3 v5, leveraging D3's `nest` and `line` functions to structure and render the data. The underlying dataset is sourced from UN population estimates, processed into a tidy format by the `loadAndProcessData` function.