A line chart displays one week of temperature readings from Rio de Janeiro, with time on the x-axis and temperature on the y-axis, along with labeled axes and a bold title. The chart uses D3.js to load CSV data, parse timestamps and numeric values, and render an SVG with a smooth curve via `d3.line` and `curveBasis`. Individual data points appear as small circles, and grid lines from the axes help read values. The visualization is built with plain JavaScript and D3, drawing the chart inside a static SVG container.