bars are a type of drug but you shouldn't use them (just kiddin use them as much as you want =) )
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Usually yes, although it is possible for there to be bars of 0 height which may give the appearance of gaps betwwen bars.
The intervals that the bars represent are touching each other.
They are essential by definition. It is not possible to have a bar graph with no bars!
The question is misguided because bars CAN, and often do, touch.
a bar graph the bars are seperated a histogram the bars are not seperated