Bar graphs are used to display data in a similar way to line graphs.
However, rather than using a point on a plane to define a value, a bar
graph uses a horizontal or vertical rectangular bar that levels off at
the appropriate level.
There are many characteristics of bar graphs that make them useful.
Some of these are that:
They make comparisons between different variables very easy to see.
They clearly show trends in data, meaning that they show how one variable
is affected as the other rises or falls.
Given one variable, the value of the other can be easily determined.
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