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Quizlet - Wikipedia
"Quizlet is a mobile and web-based study application. It is currently used by 1-in-2 high school students and 1-in-3 college students in the United States. ... Quizlet trains students via flashcards and various games and tests. As of August 2017, Quizlet has over 140 million user-generated flashcard sets and more than 20 million active learners. It now ranks among the top 50 websites in the U.S. In 2016, Quizlet was recognized by SimilarWeb as the fastest growing US Education site in 2015"