Pie charts are a kind of graphic that displays information by showing how much of a total one category is in visual form, so the size of the slices represent the size of any given category in the total
The car sales were the highest in the first quarter, and they were equal during the 3rd and 4th quarters. The 2nd quarter's sales weren't the lowest or highest of the year. Someone who might be interested in this information is the car dealership's owner, who might want to quantify the earnings of the year and decide when in the year it yields more money.