This interactive scatter plot visualizes the yearly GDP variation for the USA and Germany, with each circle representing a country-year pair. A color legend allows users to select a specific country, which highlights its points while dimming others. Built with D3 v5, the visualization uses `scaleLinear` for axes, `scaleOrdinal` with the `schemeRdYlBu` color scheme, and SVG rendering. Data is loaded asynchronously from a CSV file via `csv()`.