Final answer:
A histogram is a type of graph that allows for grouping numerical data into bins and representing frequencies with bars. It is best for showing outliers and skewness in data.
Step-by-step explanation:
A histogram allows a way to graph numerical data in 'groups' or bins that allow bars to represent frequencies. Histograms are typically used for large, continuous, quantitative data sets. They are also best suited to show outliers in data and the skewness, or asymmetry, of the data.