Data visualisation is representation of data in an interactive way.So users can easily understand it. Representing data with the help of charts and symbols seems very interactive. Also it is easy to understand data in picture form. Today number of charting libraries are available in market for creation of such charts and graphs so it not hectic to create charts. Koolchart, Google free chart, etc are widely used charting library.
http://www.koolchart.com
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http://www.koolchart.com
