Quizlet is an online learning platform that provides study tools for students. The company was founded in 2005 by Andrew Sutherland and is based in San Francisco, California. Quizlet's platform allows users to create and share study materials, such as flashcards and quizzes, and offers a variety of study modes to help users learn and retain information. The company has over 50 million active users and has raised over $60 million in funding.