This simple line chart visualizes a small dataset of monthly values across seven categories, showing the trend of a metric over time. The chart encodes each data point as a grey circle on a black polyline, with the x-axis using an ordinal scale for category names and the y-axis using a linear scale for values. The code, built with D3 v3, parses dates from the dataset and renders the SVG with a fixed size. On mouseover, circles turn red, a dynamic value label appears, and a dashed guide line drops to the baseline; the final value is labeled at the line’s end.