When you need a picture in your presentation and you haven't got a suitable one you can select an online picture. Suppose you need a picture of a mouse pointer. Go to:
Insert - Pictures - Online pictures - type your search word cursor and press enter.
If you don't want to risk copyright infringement put a check next to the Creative commons only (free available pictures). Select the picture you want and click Insert.
Unfortunately the inserted picture has no transparant background.
You can resolve this in two ways.
Set one colour with transparency.
Select the picture, on the contextual tab Picture format in the Adjust group click on the Color button. Choose Set Transparent color. Click in the part you want to make transparent.
In example below it worked on the second picture but not on the first one.
Remove the background of the picture
On the first picture we will have to remove the background. Use the Remove background button in the Adjust group of the contextual tab Picture format.
The pink areas will be removed if you click on the Keep changes button.
If you're in luck all will be perfect. If you are not you will see that some parts may have vanished as you can see in the below sample.
If you have a better and closer look you can notice some lighter coloured parts which should be kept.
Use the Mark areas to keep button and drag carefully in the missing parts.
You will see the colour change, finally click on the Keep changes button.