Nearpod is a free iPad app that allows you to run presentations and simultaniously control all iPads running that app. As you advance to the next slide on the teacher's iPad, the other iPads connected to you will advance to the next slide as well.
However, the true value of the app lies in the ability to gather feedback from your pupils through the app. This app allows you do conduct quizzes, polls, question and answers and, more impressively, drawings. Pupils can do their drawing on their iPads and submit it to the teacher who can see all the drawings and even push a particular drawing to the rest of the iPads.
This app will significantly change the way pupils engage with the content as teachers can do timely checks to ensure that pupils understand the content or concept before moving to the next part of the lesson.
You can learn more about Nearpod from their website (www.nearpod.com)