A pie chart presents data as a simple and easy-to-understand picture. It can be an effective communication tool for even an uninformed audience, because it represents data visually as a fractional part of a whole. Readers or audiences see a data comparison at a glance, enabling them to make an immediate analysis or to understand information quickly. This type of data visualization chart removes the need for readers to examine or measure underlying numbers themselves. You can also manipulate pieces of data in the pie circle to emphasize points you want to make