This interactive line chart tracks the exchange rates of various global currencies against the euro, with a dropdown menu to switch between different currency selections. The visualization displays a time series of daily rates, augmented by a red exponential moving average line that reveals underlying trends, while a crosshair with a trackball follows the mouse to show precise values for any date and rate pair. The chart is rendered as an SVG using the D3.js library, with grid lines, axis labels, and a legend. The code also incorporates the d3fc framework for chart components and a custom area chart beneath the line to emphasize the rate’s magnitude over time.