This example visualizes Google Play Store app data with a bar chart that sums app reviews by category, color-coded by content rating. The visualization is built using the vega-lite-api library, which registers with vega and vega-lite, and renders as an SVG via vega-tooltip for interactivity. It loads data from a CSV URL using d3.csv, sorts the categories by review count, and displays tooltips showing aggregated review sums. The appearance is customized through a shared config object that adjusts axis ticks, label fonts, and color styling.