What is an interactive whiteboard ??

Interactive whiteboard in school

An interactive whiteboard is a piece of hardware that looks much like a standard whiteboard but it connects to a computer and a projector in the classroom to make a very powerful tool. When connected, the interactive whiteboard becomes a giant, touch-sensitive version of the computer screen. 

Instead of using the mouse, you can control your computer through the interactive whiteboard screen just by touching it with a special pen (or, on some types of boards, with your finger). Anything that can be accessed from your computer can be accessed and displayed on the interactive whiteboard, for example Word documents, PowerPoint presentations, photographs, websites or online materials.
Using special software included with the interactive whiteboard, you can also interact with images and text projected on the board: rearranging them, changing their size, colour, etc. This offers a much more interactive experience than using a standard whiteboard or using a data projector alone. 

*Source : Here