This example presents monthly housing data from January 1991 to April 2013, displaying two time series: the Housing Price Index (HPI) and the number of homes sold. The visualization uses D3.js v7 with SVG rendering and an animated, interactive line chart. Users can hover over a line to highlight it while dimming others to light grey, or click a series to toggle its visibility. The implementation leverages `d3.line`, `d3.scaleTime`, `d3.scaleLinear`, and `d3.axisBottom` within a React framework.