A line chart displays the average ratings of board games from 2015 to 2019, with separate lines tracking the counts of top-rated titles like Dominion, Codenames, and Gloomhaven. The visualization uses D3 v5 to load CSV data via `d3.csv`, nest and aggregate ratings by year using `d3.nest`, and render the resulting counts with `d3.line` and SVG. Axes are generated with `d3.axisBottom` and `d3.scaleLinear`, while a second SVG contains a bar chart.