Quizlet is an online study tool that allows over 30 million users in 130 countries to create and share flashcards and study sets. It was founded 10 years ago by Andrew Sutherland to help students master course content. Users can access Quizlet through the website or mobile apps to study vocabulary terms, definitions, and diagrams anywhere. Instructors can use existing study sets or create their own to engage students both in and out of the classroom through games and activities. The platform aims to make studying more convenient and interactive for digital natives.