This SVG area chart displays total annual rainfall in India from 1960 to 2017, aggregated by year across all states. It uses D3 v7 to load CSV data via `d3.csv`, group and sum rainfall values with `d3.group` and `d3.sum`, and render the area path with `d3.area`. A hover tooltip, built with a D3 overlay rectangle and `d3.bisector`, shows the exact year and rainfall total. The chart includes labeled axes and a title, with styling from CSS.