Decks allows you to create flashcards to learn vocabulary or any other similar information for long-term retention. If you are looking to create flashcards to cram for an upcoming exam, this is not the application for you.
Decks will help you review your terms over different time periods to help them reach your long-term memory and become part of your active vocabulary. It is designed to be used daily, adding and learning new words and reviewing terms that are ready to be refreshed.
Decks is easy to use. Add new terms. Study them until you feel comfortable with them, then swipe them away and into the review system. The app will let you know what to review and when. Just be consistent and you will master your words.