Flashcards are a learning tool that consists of a set of cards, typically made of paper or cardboard, with information on both sides. They are used to aid in memorization and review of information. One side of the card usually contains a question, concept, or term, while the other side provides the answer or explanation. Flashcards are often used in studying for exams, learning new vocabulary, or practicing math facts. They can be shuffled and reviewed repeatedly to reinforce learning and improve retention.