This interactive line chart displays the Consumer Price Index (CPI) for corn, rice, rye, and wheat from 2000 to 2015, with each grain represented by a distinct colored line and gray circular data points. Hovering over a point reveals a tooltip with the specific year, CPI value, and grain type, while the chart includes labeled axes, a legend, and a title. The visualization uses d3.csv to load external data, d3.scaleLinear, d3.line, d3.axisBottom, and d3.axisLeft for scaling and axes, and appends SVG paths and circles for rendering. A d3.legendColor legend with custom triangle shapes identifies the grain series. The graph is built with D3 v7 inside a React framework, rendering to SVG based on window dimensions.