This example displays monthly gas prices for 2021 using an SVG line chart. The visualization uses D3 v5 to load CSV data and render a smooth curve, with labeled axes for months and price in dollars. It employs d3.scaleTime and d3.scaleLinear to map data values, d3.axisLeft and d3.axisBottom for gridlines and ticks, and d3.line with curveBasis for the curved path. The code also uses d3.csv for data parsing and d3.timeParse to convert month strings into date objects.