- Launch Microsoft PowerPoint and open the presentation that contains the object you want to circle.

- Go to the slide where you want to add the circular highlighting.
- Click on the "Insert" tab in the ribbon at the top of the PowerPoint window.
- Click on the "Shapes" button in the "Illustrations" group.
- From the dropdown menu, select the "Oval" shape (which is used to draw circles).
- Click and drag on the slide to draw the oval shape. While dragging, hold down the "Shift" key to ensure you create a perfect circle instead of an ellipse.

- With the circle shape selected, you can customize its appearance:
- Right-click on the circle and choose "Format Shape" from the context menu to open the "Format Shape" pane.
- In the pane, you can adjust the line color, line style, fill color, and other properties to match your preferences.

- Move and resize the circle to encompass the object you want to highlight. To make it transparent you can choose to not fill any color to the shape which is added.

- If the circle is covering the object you want to highlight, you can right-click on the circle, go to "Order," and choose "Send to Back" to move it behind the object.
- After you've added the circle to highlight the object, remember to save your presentation.