a progressive change of one subject.
For example: your salary over time or the size of a sponge as you add drops of water.
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There is no "this". There is no point in showing nothing on any kind of graph!
While a line graph can help with interpretation by showing the changes in values as a line, there are times when it is not the best king of graph for a particular situation. That is why other kinds of graphs have been developed.
A pie chart.
Bar Graph
For any data that can be best expressed as percentages of a whole, a pie chart or pie graph is appropriate.