This grouped bar chart visualizes the count of patients by chest pain type and sex, distinguishing between males (steelblue) and females (pink) with a legend. It uses D3.js APIs including `scaleBand`, `scaleLinear`, `axisLeft`, and `axisBottom` to render the axes, and interactive tooltips on mouseover. The data comes from the heart-failure-prediction Kaggle dataset, while custom axis labels and an inner rectangle background enhance readability. The visualization is rendered as an animated SVG.