In our Data Visualization 101 series, we cover each chart type to help you sharpen your data visualization skills.

For a general data refresher, start here.

Pie charts are one of the oldest and most popular ways to visualize data. This classic chart is the perfect example of the power of data visualization: a simple, easy-to-understand presentation that helps readers instantly identify the parts of a whole. Without further ado, here’s everything you need to know about the pie chart.