This area chart visualizes the monthly cost of mobile phone prices, with a smooth curve and gray-filled area beneath the line. Built with React and rendered as an SVG, it uses D3 v5 scales (`scaleTime`, `scaleLinear`) and axis generators (`axisBottom`, `axisLeft`) to plot data from a CSV file, with grid lines and labeled axes for month and cost. The chart applies `curveBasis` to both `line` and `area` generators for a polished, flowing appearance.