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Bar graphs are used to compare objects in different classifications or to track changes over time. These are some of the earliest charts that use "bars" to illustrate data visualisation. These are one of the most typical data representation charts, and they are both useful and simple to understand.

Pie charts show data in a circle, with "slices" equal to percentages of the total, whereas bar graphs show data in a more flexible fashion by using bars of various lengths.

If your data is discrete, use bar charts or histograms; if your data is continuous, use line/area charts. Use a scatter plot, bubble chart, or line chart to depict the relationship between values in your dataset.

Bar graphs are used to compare two groupings of data or to follow changes over time. When attempting to evaluate change over time, however, bar graphs work best when the changes are significant.

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