There are all kinds of charts and graphs, some are easy to understand while others can be pretty tricky. There are so many different types because each one has a fairly specific use. Pie charts can be used to show percentages of a whole, and represent percentages at a set point in time. They do not show changes over time.
An example using real education data would be if you wanted to show the percentages of the race/ethnicity of public school students across the U.S. for a particular school year. If you want to see what this would look like click on the link "Click here to fill in example using education data from NCES," that you will find on the next page.
You are now ready to create your own pie chart...