This scatter plot visualizes Udemy courses, showing the relationship between course price (x-axis) and the number of subscribers (y-axis). Each circle represents a course, colored by its subject category via a color legend on the right. The visualization uses React with D3 v5 to render an SVG, employing `d3.scaleLinear` for both axes, `d3.scaleOrdinal` for the categorical color mapping, and `d3.format` for axis tick labels. Data is loaded from a CSV file using `d3.csv`.