Flashcards are a study tool used to enhance memory recall by displaying a question or term on one side and the answer or definition on the other. They are effective for studying vocabulary, facts, and concepts, allowing for self-testing and spaced repetition. To create flashcards, identify key terms or concepts to learn, write them on one side, and their definitions or explanations on the opposite side. Flashcards can be physical or digital, with many apps available for easy access and organization.