A grouped bar chart shows prison admissions in Nigeria from 2013 to 2016, with each year’s total population segmented by religion. The visualization uses Vega-Lite API and d3.v7 to load CSV data from the Nigerian National Bureau of Statistics, mapping the Year field to the x-axis, Population to the y-axis, and Religion to color. Bars are rendered with 50% opacity and tooltips display population values on hover, while the custom config adjusts font sizes and axis styling for readability.