A
flashcard or
flash card is a set of cards bearing
information, as words or numbers, on either or both sides, used in classroom drills or in private study. One writes a question on a card and an answer overleaf. Flashcards can bear
vocabulary, historical dates, formulas or any subject matter that can be learned via a question-and-answer format. Flashcards are widely used as a
learning drill to aid
memorization by way of
spaced repetition.