As well as iPads, we now have Apple TV boxes and connectors. Their basic function is to project the screen of any iPad in your classroom wirelessly on to the board using the projector.This article gives an overview of the different ways they can be used.
The article identifies the following five benefits:
1. Position of teacher in the classroom
2. Improved pedagogy
3. Instant feedback
4. More dialogue
5. Improved motivation
You can read the full article here: