A line chart tracks daily Covid-19 cases in the United States from 2020 to 2023, using data from the New York Times GitHub repository. The visualization, built with D3 v7 and SVG, employs `d3.scaleTime` and `d3.scaleLinear` to map dates and case counts, with `d3.line` generating the trend curve. Axes are formatted with quarterly month ticks and abbreviated counts, while gridlines and labeled axes clarify the temporal and numerical scales.