This visualization displays daily COVID-19 case counts from NYC Health Data as vertical black bars over time. A black tooltip with orange text appears on hover, showing the specific date and number of cases for each bar. The chart uses d3.csv to load the data, d3.scaleBand and d3.scaleLinear for the axes, and the d3-tip library for tooltip functionality. SVG rectangles render the bars, which turn orange on mouseover.