Actually, they are useful. At least in some cases.
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bar graphs are simply used like any other graphs just to figure out any kind of data.
Bar graphs are usually used for comparing. You could go into more detail, but that's the gist of it..
Most graphs: Pie charts, bar graphs, histograms, scatter graphs can all be used.
Bar graphs are used to display countable data that are grouped in categories.
A bar graph is used to show different totals in different categories.
Yes - in the usual orientation of bar graphs. However, bar graphs can be horizontal.