In a PowerPoint chart, Data Labels are used to display various types of information. You can display the value, and/or the name of the Chart Series, and/or the Categories right within or above the Series on the chart. Adding Data Labels can help the presenter reveal exact values along with the Series, so that he or she need not check on the Value axis to ascertain approximate values of any Series. In a default PowerPoint chart, you won’t be able to see the Data Labels enabled.
Learn how to add Data Labels within charts in PowerPoint 2013 for Windows.