This example demonstrates a bar chart that displays GDP by country, with interactive tooltips that appear when the mouse hovers over each bar. The tooltip shows the country name and follows the cursor’s position, updating its coordinates on mouse movement. Built with D3 v6 and JavaScript within an HTML page, it uses SVG for rendering and loads data from a CSV file, including country names and GDP values. The implementation relies on D3’s scaleBand, scaleLinear, event handling, and DOM selection methods to create the interactive experience.