This stacked bar chart visualizes attendance data from `attendence.csv`, showing the number of items per course code (y-axis) across different days of the week (x-axis). The bars are segmented and colored by attendance status, such as present or absent, with a legend for filtering. The visualization is built with D3.js, using `d3.scale.ordinal()` for the x-axis, `d3.layout.stack()` for the stacked layers, and `d3.tip()` for tooltips. The colorScale uses `d3.scale.category10()`, and the chart is rendered as an SVG with animation support.