The chart displays daily COVID-19 case counts for five Scandinavian countries across October 2020, plotted as multiple colored lines over a shared day axis. It uses d3.csv to load the data, d3.line and d3.scaleLinear to generate the paths and coordinates, and SVG elements with CSS classes for styling. The y-axis shows case numbers, the x-axis shows days, and a legend identifies each country’s line color.