An interactive scatter plot displays the relationship between Temperature and Humidity, with points colored by HVAC Usage. The plot uses a time-series dataset of building sensor readings, plotting each data point as a circle. The visualization is rendered using D3.js, specifically leveraging `scaleLinear` for axis scaling, `scaleOrdinal` with `schemeCategory10` for the color mapping, and custom modules for rendering axes and a color legend. The implementation relies on D3's selection joins and the CSS selector API to efficiently manage the SVG elements.