Make it so
A trigger is an object on your PowerPoint slide - a picture, a shape, a button, or even a paragraph or text box. When you click on it an action is initiated. The action might be a sound, a movie, an animation, or text becoming visible on the slide.
Microsoft Office Online has a tutorial:
Use triggers to create an interactive slide show in PowerPoint
"Here's a Power User column for teachers. Want to involve your students more in a presentation? Set up "triggers" for them to click as they go through the show. Triggers (related to animations) lets you add surprise to your slides while inviting your viewer to take part and have fun."
All 'Bout Computers:
Trigger Happy Animations in PowerPoint
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