This line chart shows the growth of VizHub’s user count from its launch in August 2018 through June 2020. The code uses d3.v4 with an SVG rendering approach, employing `d3.scaleTime`, `d3.scaleLinear`, and `d3.line` with a monotone curve. Data points are marked as circles, and the chart includes custom SVG annotations from `d3-svg-annotation` to highlight key events like a Medium post and the VizHub 2.0 Kickstarter. The data comes from a CSV file tracking user totals over time.