A histogram is an important device for exploring the shape of the distribution of the values of a variable. Histograms are used for checking normality, screening of outliers, or suggesting another parametric shape for the distribution. A histogram basically breaks the range of values of a particular variable into intervals of equal length.

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Histograms can refer to diagrams consisting of rectangles whose area is proportional to the frequency of a variable and whose width is equal to the class interval. Histograms were first introduced by Karl Pearson.

A histogram which is a summary graph that illustrates a count of the data points that drop in various ranges is very useful and a convenient way to display data. It is useful especially when you do have numerical data that is characterized by discrepancies as it will allow you to look at the tendency of that data.

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