A pie chart, also known as a circle graph, is used to show percentages. A whole circle represents 100% and then it is divided into slices which represent portion of the total. Using a pie chart in Excel helps the person to know the data just by having a glance at it. The biggest piece can easily be noticed. You can even use other things like labels and percentages that can be written on the diagram.
Follow this step by step tutorial to learn how to create and modify a pie chart in Microsoft Excel easily.