Tencent Interactive Whiteboard provides a comprehensive digital whiteboard service that enhances interactivity between students and teachers in online classrooms. It offers rich, intuitive features that make class fun and more effective, including interactive graffiti, real-time synchronization, file sharing, media sharing, and file transcoding. It can also record and play back full teaching sessions with whiteboard presentations and audio/video in sync. High scalability and flexible use deliver an interactive teaching experience on par with that of an in-person class, significantly improving the quality of online education.