A grouped bar chart compares vacation trips within the Netherlands versus abroad across quarterly periods, using green and red bars (via CSS classes) to show 2019 and 2020 values. The visualization loads CSV/JSON data, converts values to millions, and renders with d3.scaleBand and d3.scaleLinear, while d3.axisLeft and d3.axisBottom draw the axes. Data filtering separates domestic and international travel using custom transform functions, and the SVG output is styled with a shared stylesheet.