Using d3 and the vega-lite-api, this visualization plots the relationship between course price and the number of subscribers in a business-and-finance Udemy dataset. A bar chart displays each course’s price on the x-axis and subscriber count on the y-axis, with bars colored by instructional level. The chart reveals that most beginner-level courses are priced between $20 and $80, while the most expensive courses also attract the highest subscriber numbers. Data loads asynchronously via d3’s CSV parser, and rendering uses vega-lite’s markBar encoding with a custom config for axis styling and tooltips.