This example demonstrates draggable, zoomable circles rendered as an SVG visualization. Users can drag individual circles to reposition them and zoom or pan the entire scene using mouse or touch interactions. The visualization uses D3’s `drag` and `zoom` behaviors, with a state management pattern that updates circle coordinates and the group transform on interaction. Initial circle positions, sizes, and colors are hardcoded as static data, while the `d3.select`, `join`, and `attr` methods handle dynamic rendering and updates.