An online quiz mobile app is a platform where users can participate in various quizzes, tests, and trivia games from their mobile devices. The app may offer a wide range of topics, such as general knowledge, science, history, sports, and more. Users can choose the quiz they want to play, answer questions in a limited time, and receive instant feedback on their performance. Some apps may offer leaderboards, badges, and rewards to encourage users to compete and improve their skills. The app may also provide features like creating and sharing quizzes, inviting friends to play, and tracking progress over time. Overall, an online quiz mobile app is a fun and engaging way to test and enhance one's knowledge and intelligence.