PowerPoint contains several types of diagrams, and they all can be customized to fit your needs. They're all inserted the same way.
Select the slide on which you want to place the diagram. The slide will appear.
Click on the Insert Diagram or Organization Chart button. The Diagram Gallery dialog box will open.
Double-click on a diagram type. The diagram will appear on the selected slide.
After placing the diagram, you can click inside any part of it and type text.
Click on the text placeholder for the shape to which you want to add a text caption. The text placeholder will disappear, and the cursor will appear in the middle of the shape.
Type the text. To add multiple lines of text to a shape, press Enter at the end of each line. The text will appear inside the shape.
Add text to the other shapes in the diagram.