Depending on the topic of your talk and your audience, you may want to add small images to selected slides, or create an entire slide with only an illustration or photograph. You need to make sure that you have space on a slide for the image or illustration. However, there is not much space on this slide, so if you were really giving this talk, you would add a slide after Slide 6 with an illustration of this concept. About 80 images are installed during a standard installation of PowerPoint 97. It is up to you to decide how appropriate images are for your presentation.
Images are good to use, particularly if they support or further explain ideas.
You might want to add other types of images to your presentations, like an organizational logo on the title slide, or a diagram of a concept you are explaining in your presentation. You can add images from many other sources. Most Windows-compatible graphic formats, like .gif, .jpg, .wmf, .bmp, .pcx and many others, are supported by PowerPoint 97. Adding images from other sources requires that the correct import filters were installed, and you might need to add filters if you have trouble with a particular type of graphic. You can also create many images yourself, using the drawing tools.