The graph that is most used for categorical data is the pie chart. Bar graphs have also been used for categorical data.
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bar graphs use categorical data
Categorical data is the statistical data type consisting of categorical variables or of data that has been converted into that form, for example as grouped data.
histograph
graphs are to compare and contrast data
Line graphs are the best graphs in order to display differences in data over time because the trends (if any) are easy to point out, as opposed to a bar graph, which deals with categorical data, or a pie chart, which deals with relative frequency.