This line chart tracks VizHub’s cumulative user count from its August 2018 launch through July 2021, with annotated spikes tied to product milestones like the 1.0 release, a Kickstarter, and a 2020 Datavis course. Rendered as an SVG using D3 v5, the visualization employs time and linear scales, gridlines, circles with tooltips, and `d3-annotation` labels to highlight growth events. Data comes from a CSV file mapping dates to user totals.