A stacked bar chart displays attendance records by module, day, and course code, with bar segments colored by course and the legend enabling filtering. The visualization, built with D3.js version 3.5.5, uses `d3.layout.stack` for the stacked bars, `d3.scale.ordinal` for the x-axis, and `d3.legend.color` for the interactive legend that highlights segments on hover. Data is sourced from `attendence.csv`, with tooltips provided via `d3-tip`.