1) A whiteboard is a non-electronic variation of the traditional "rewriteable" schoolroom blackboard, but is white instead of black and of a material that can be written on with colored markers (known as dry erase markers). Dry erase markers are easier to erase than the chalk used on a blackboard (which sometimes requires a wet rag for thorough erasing).
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2) In electronic education technology and computer networks, an electronic whiteboard is one of several kinds of writeable presentation display systems that can be used in a classroom or videoconference. These whiteboards generally fall into one of three categories: standalone copy boards, where the content of the whiteboard can be scanned and printed out; peripheral boards, which transfer information in the form of digital files to an attached computer; and interactive boards, the most expensive and sophisticated option, which are like large touchscreen monitors that can be synchronized to an attached computer -- users can interact with the display, visit Web sites, and access databases directly from the board. Some peripheral boards can accommodate a projector that can be calibrated to the display, making them interactive. There are a number of add-on whiteboard digitizer products available, such as mimio and eBeam, that can be used to make traditional dry-erase whiteboards interactive.
3) In some groupware programs in which remote users teleconference from their PCs, a whiteboard is a space on the display in which one or more participants write or draw, using a mouse, keyboard, or other input device.