This interactive scatterplot displays five data points from a CSV file, connected by a line to reveal a downward trend. Clicking a square point highlights it with a white fill and bold black stroke. Built with React and D3 v7, the visualization uses `scaleLinear` for axes, a D3 line generator for the path, and `ResizeObserver` to make the SVG responsive. The `selectAll('rect').join('rect')` pattern renders the clickable points with custom colors.