For starters, Explain Everything is an app that allows you to use the iPad as an interactive whiteboard (with an Apple TV to mirror the display on a projector). You can import files, such as PowerPoint, Keynote and images, from dropbox and other services. This is just the start! You can save your annotations on the existing or blank slides or add a voice over to create a movie.
Example of use in the classroom
Do a maths solution, chemistry question etc on the whiteboards with a voice over. This can then be uploaded to You Tube for students to review at their leisure.
This video is a basic overview of how you can use Explain Everything
This is a video I produced for my Year 13 Economists using Explain Everything.