This line chart visualizes customer counts per year from a small CSV dataset, with a red path connecting data points across a band scale for years and a linear scale for customer values. The D3 v7 code loads data via `d3.csv`, renders axes with `d3.axisBottom` and `d3.axisLeft`, and draws the line using `d3.line()` within an SVG container. Labels for both axes are added as SVG text elements.