Flashcards has three key concepts that are helpful to understand: collections, decks, and cards.
Collection: When starting out with the Flashcard application, the instructor or student must first create a collection. A collection is like the "folder" concept in personal computers; however, instead of costaining files, a collection contains decks. A collection will may correspond to a book, a city, a course or some other topic. In the above example, it the course title Latin 101. Only after a the collection is created can the user create decks of cards that will exist within that collection.
Deck: As previously mentioned, a collection may contain any number of decks, which are groups of cards. In the Latin 101 example, a deck was created that contains all the verbs in chapter one and was given the name, "Verbs.: A second deck, "Nouns," was also created.
Card: Just as collections contain decks, decks contain cards. A card is the most basic item in the application, and is analogous to a 1 1/2 x 3 1/2 card you may have used as a student. In the above example, the deck, "Verbs," contains many cards, one for each verb to be studied.
To recap: A collection is a grouping of any number of decks, and often corresponds to a text book or course. A deck is a group that can contain any number of cards; usually a deck contains a logical grouping, such as vocabulary from a particular chapter. A card, the most basic unit, corresponds to an item being studied, such as a vocabulary word, or an image in an art history class. When using the application, the steps to set up your course will be to first create a collection, then create one or more decks. Finally, you will either manually add cards to the deck, or batch upload cards to a deck.