A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
PowerPoint doesn't have anything like that built in. To simulate the effect, stack the two photos on top of each other. Then give the top photo an animation that causes it to fade out (revealing the lower photo), and a second animation to fade back in. Add 2 shapes to the slide and set them to trigger the animations. Please post again if you need step-by-step instructions on how to do this.