Bar chart

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A bar chart.

A bar chart is a type of chart which shows the values of different categories of data as rectangular bars with different lengths. A histogram is a bar chart that shows how data is spread over its categories. It is another one dimensional diagram also known as pillar diagram or column graph . These bars donot have any specific width but the height of the bar is proportionally to the value of an element . When the variations are small this method is very efficient .