Pie chart is a popular way of displaying data in a visually appealing way. However, there are other terms that can be used to describe this type of chart such as circle graph, pie graph, and sector chart. A circle graph is similar to a pie chart but it does not necessarily have to be circular in shape. A pie graph and a sector chart are similar in that they both show a circle divided into sections, but a sector chart displays more than one variable. Regardless of the term used, all of these charts are useful for showing a quick and easy-to-understand representation of data.