A bar graph is useful in comparing something across multiple groups. Bar graphs are also useful in tracking discrete event changes over time. 
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Bar graph is pictorial representation of numerical data by bars (Rectangles). 

Example1: Let us represent the below data using bar graph.
Bar Graph:


Example2: The following information was collected about student's favorite activities or pass times.
This can be shown in a bar graph, as follows.
From the graph, we can see that most students like to play soccer, and then basketball, then rugby, and the least is chess. 

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