iReview is a tool to help you memorize important information, using the model of "flashcards" or index cards, with a question on the front and an answer on the back. You can share those cards with others via email.
iReview lets you enter any number of cards, organized into card sets, and review them. You can put check marks on the ones that you didn't know and later review only those. It also provides a random mode to show the cards in random order.
On the iPad, iReview also permits you to put drawings on the front and back.
iReview includes three small built-in card sets for French vocabulary, Chinese numbers, and nutrition science.
Update for iPad Pro (both full screen and split view multitasking).
Update for iPad Air 2 (split view multitasking).