I think bar plot only 1 bar is rare.
By the way, bar plot with more than 2 bars is thought as the easiest type of
Stratified Graph
.
Bar plot is very simple and known by everyone. So it is useful tool for presentation.
Histogram is the graph of frequency data of 1-dimension data.
In this meaning, bar plot is the graph of frequency data of 0-dimension data.
Pareto Chart is used in Quality study and Management study .
It is stratidied qrequency bar plot in descending order.
NEXT 
Graphs of 1-Dimension Disribution
Tweet