You may have started from scratch with inserting a new chart on your PowerPoint slide. This of course brings up an instance of the Excel sheet with some dummy data, and indeed you can type in your own data to replace this dummy data.
To learn more, choose your version of PowerPoint. If we do not have a tutorial for your version of PowerPoint, explore the version closest to the one you use.
Microsoft Windows
Creating Charts Using Existing Excel Data in PowerPoint 2013
Apple Mac
Creating Charts Using Existing Excel Data in PowerPoint 2011

Tutorial Code: 10 05 08
Previous: 10 05 07 Switch Series and Categories for Charts in PowerPoint
Next: 10 06 01 Chart Data Labels in PowerPoint
