Histogram

Source - http://www.analyzemath.com/statistics/histogram.html

A histogram is representations of how frequent something that is being measured has happened. Histograms can measure a number of different things. Each bar is a representations of how many people fall into the category of what their height is. Histograms differ from bar graphs because of the how close the bars a located to each other.  This picture above is the height of 30 people and how frequent people have the same height.