As I often tell my readers here, using images rather than line and line of bullet pointed text creates a much more effective presentation, and something that your audience will find much more interesting
However, not everyone has a large file of stock photography and so we are often tempted to google search an image and then use that. Publicly using images you have taken from an internet search is illegal and so you should not do it.
But help is at hand!!! The Wiki organisation has a website called “Wiki Commons” Here you can download images for free and use them in your presentation. All you need to do is to credit the artist or photographer.
So, next time you are searching for an image to use in your presentation, go along to the Wiki Commons site and see if what you are looking for is there.