The technical principles behind interactive board are based on optical or electromagnetic induction principles. In the optical principle, Interactive Boards emit infrared or laser beams, which are then detected by photodetectors to determine the user's operation on the board. In the electromagnetic induction principle, Interactive Boards use an electromagnetic induction panel to detect the position of an electromagnetic pen, thereby determining the user's operation. Different technical principles have their own advantages and disadvantages, and users can choose the Interactive Board that best suits their needs.