Histogram is the most common graph used to represent numerical data.
Histogram looks similar to a bar chart but is very different.
In a bar chart, only the vertical axis represents numerical data(absolute frequency) but in Histogram, both the vertical and horizontal axis represents numerical data.
Each bar in a histogram has a width equal to the interval and height equal to frequency.
unlike a bar chart where different bars represent different categories, a histogram has bars that show a continuation of the intervals.
We may create histograms with unequal intervals(eg: age) as well depending on the use case.