Communication delivered over multiple channels is more efficient than communication over a single channel. Multiple channels make it more likely that the whole message will be received. An appropriate picture adds another channel.
You can use charts, images, multimedia content, sound, etc. to represent and idea or simulate a case.
You can keep your audience (students) motivated by using animated PowerPoint and funny slides describing a topic or problem.
PowerPoints can be shared with your students and support the learning process. Especially using PPT sharing platforms like SlideOnline.