From the Educreations webpage:
Educreations is a recordable interactive whiteboard that captures your voice and handwriting to produce amazing video lessons that you can share online. Students and colleagues can replay your lessons in any web browser, or from within our app on their iPads.
One of the many reasons Educreations was picked for our teachers was its simplicity. The iPad app is easy to pick up and use and if teachers want to create a class on the Educreations website they have some powerful features available all for FREE. This is a fantastic tool to use with students as well as having students creating their own lessons to show what they have learned.