What is the difference between Histogram and bar graph?

A histogram and a bar graph looks similar but they have more differences than similarities :

1.A bar graph can be drawn for both discrete and random date but histogram can only be drawn for continuos data.

2.The width of the rectangle in a bar graph is of no significance but in a histogram width of the rectangles represent class-width and is equally important as height of the bar.

3.Area under each rectangle represents proportional frequency in a histogram whereas there is no such explanation in bar graph.

4.There are no gaps left between the rectangles in a histogram,whereas a bar graph has gaps left between the bars.

5. Representing a data as histogram gives us the value of "mode"

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