What is Piechart?
A pie chart is a circular statistical graphic, which is divided into slices to illustrate numerical proportion. In a pie chart, the arc length of each slice (and consequently its central angle and area), is proportional to the quantity it represents. Pie charts are widely used to show the relative proportions of different categories in a data set. Each slice in the pie chart represents a category, and the size of the slice is proportional to the percentage of the total that the category represents. Pie charts are most useful when the data set has a small number of categories, and when the categories are mutually exclusive (so that the total of the categories adds up to 100%). They can be useful to show the proportion of different categories within a whole and are suitable for showing the composition of a whole.