FluentU uses authentic video content—such as music videos, commercials, and news clips—as its foundation for language lessons. The platform features interactive subtitles that allow users to click on any word for a definition, example sentences, and pronunciation. New vocabulary can be saved as flashcards, which are then reinforced through personalized quizzes. While it offers a method for learning vocabulary in context and improving listening skills, it does not provide explicit grammar instruction or speaking practice.