# Nominal data appear better on bar chart and Interval data on line-chart

I read this somewhere that Nominal categorical data makes sense in a (stacked) bar chart, but not in a (bivariate) line chart AND Interval data makes sense in a bivariate line chart, but not in a stacked bar chart.Can anyone explain me the above statements with some sort of example ?

Source(Look at the end of the webpage under Exercise section)