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In the past, while making presentations or explaining new products, people had to rely on charts, graphs and drawings. While charts, graphs and handmade drawings are useful in their own ways and can be prepared according to specific requirements of a project, there are a number of limitations involved in this process. For one thing the amount of time consumed in preparing these charts and drawings on paper in significantly high. As most of these charts on paper have limited re-usability, editing the contents for re-use is not a convenient option. As a solution to many of these problems, in later period, the use of projectors for viewing slide shows became more popular. One of the chief advantages of these projectors is that as the size of the projected image can be c View the rest of this article