Differences between 'bar graph' and histogram

Table highlighting the key differences between Histogram and Bar Graph 



Two key differences for beginners 



Statistics behind the two 



One more difference is that: 

The bars of bar charts typically have the same width. The widths of the bars in a histogram need not be the same as long as the total area is one hundred percent if percents are used or the total count if counts are used. Therefore, values in bar charts are given by the length of the bar while values in histograms are given by areas. Wikipedia includes examples of histograms with bars of unequal width such as in figure below.



References 

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% KeyDifferences

% EdrawSoft

% Forbes