• Bar graph or bar chart or bar diagram means the same
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• The recommendation is that we should use a bar graph when we are comparing categorizes data or when we're comparing items between different groups.
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• The bar ghraph could be either horizontal or vertical
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• By default, the horizontal axis (or x-axis) shows the data categories. On the other hand, the vertical axis (or y-axis) is the scale for the categories.
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• They allow the reader to identify patterns or trends in a more easily way than tables with only numeric data.