A line chart displays the population of Hyderabad from 1990 to 1999, with years on the x-axis and population on the y-axis. The React application uses D3’s `csv` to load and sort the data, and `scaleTime` and `scaleLinear` to map values. The line is drawn using `line` with a basis curve, while custom axes, green tick lines, and aqua tick text are rendered as SVG.