History
Originally, Google offered charts as a PNG image of a chart from data and formatting parameters in an HTTP request.
But since April 2012 Google is now using SVG (VML for older browsers) to draw the charts. The Google Image Charts API is deprecated (but still works).
Originally it was an internal tool to support rapid embedding of charts within Google's own applications (like Google Finance for example). Google decided it would be a useful tool to make available to web developers. It officially launched on December 6, 2007.
Currently, line, bar, pie and radar charts, as well as Venn diagrams, scatter plots, sparklines, maps, google-o-meters, and QR codes are supported.
Read more about this topic: Google Chart API
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