A step line chart holds each value flat until the next point, then jumps - drawing a staircase that suits values which change in discrete steps rather than sliding smoothly.
When a value stays constant between readings and changes suddenly - interest rates, inventory counts, a setting that holds until updated. A straight line would imply gradual change that did not happen.
A spline smooths between points, suggesting continuous change. A step line does the opposite: it keeps each value level and shows the change as a clean jump.
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