This interactive sunburst chart visualizes hierarchical sequences of ICT support ticket categories, showing the distribution of ticket counts across nested portfolio and system classifications. The visualization uses D3.js v3 with the `d3.layout.partition` layout and `d3.svg.arc` to render the radial segments, while mouseover events trigger breadcrumb updates and opacity fading to highlight the current ancestry path. Data is loaded from a CSV file and structured into a hierarchy, with a legend toggled by a checkbox. The central description area displays the percentage each segment represents of the total ticket volume, with animated transitions restoring full opacity on mouseleave.