This visualization shows the daily Federal Funds borrowing rates over time, displayed as a smooth curved line chart with data points colored on a gradient from blue to red based on their value. Built with React and D3 v7, it uses `scaleTime` and `scaleLinear` to map dates and rates to SVG coordinates, with custom axis components and a line path generated via `d3.line` with cardinal tension. The data is fetched from a CSV file containing historical rate values, and the chart includes interactive tooltips showing the exact date and rate for each point.