Nearpod makes presentations possible in a way that was previously impossible. It gives the presenter controls that they wouldn't have with a standard PowerPoint presentation (and it's free). Teachers send the digital presentation out to student devices and control what students see. Students interact and respond to the presentation, and the teacher can monitor student progress.
"A wonderful resource which for educators to present lesson slides and resources to a class on their own Apple/Android devices. The teacher can set the pace and chooses when the slides move on. This tool allows you to show images, text and set tests/quizzes in real time and collects the data."