A React-based line chart visualizes cumulative global COVID-19 deaths over time, with the date on the x-axis and death totals on the y-axis. It uses d3.scaleTime, d3.scaleLinear, and d3.line to generate an SVG path, plus custom axes via d3.axisBottom and d3.axisLeft. Reference lines mark the 5,000,000 death milestone and the most recent date, with d3.timeFormat and d3.format for labels. Data comes from a CSV fetched via d3.csv.