A line chart displays cumulative global COVID-19 deaths over time, sourced from the Johns Hopkins Coronavirus Dataset. The chart uses a linear y-axis scale (d3.scaleLinear) and a time-based x-axis (d3.scaleTime), with the line path generated via d3.line. React manages component state, while d3.axisBottom and d3.axisLeft render the axes with tick marks extending across the plot area. SVG elements draw the chart, styled with CSS for gridlines and the line stroke.