it is for compareing two things
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a bar graph is just a graph but a double bar graph compares 2 things!
no a double bar graph is better
The difference between a bar graph and a double bar graph is...... A bar graph displays one set of data, and a double bar graph compares two different sets of information/data.So should have a key.
A double bar graph plots two sets of data on a single chart, whereas a bar graph plots just one.
they both have bars?