This scatter plot visualizes the relationship between square footage and price for real estate properties across various European cities, with each point colored by city and a tooltip revealing detailed property information. Built with D3.js v7, it renders as an SVG using `d3.scaleLinear` for the axes, `d3.scaleOrdinal` with `d3.schemeSet2` for color encoding, and interactive mouseover events to show tooltips. The visualization also includes a legend listing all cities, with data loaded from the local `data.csv` file.