A scatter plot matrix reveals pairwise relationships among six happiness factors and overall life satisfaction for countries in the 2020 World Happiness Report. The visualization uses D3 v7 with an SVG renderer, building a grid of cells where each cross-section plots two variables. Axes are rendered at the edges using `d3.axisBottom` and `d3.axisLeft`, while `d3.scaleLinear` maps data values. Circles colored by `d3.scaleOrdinal` with `schemeTableau10` represent countries, and hovering triggers tooltips showing country names and values. A legend identifies the regional indicator groupings.