It can be very hard to find data such as pie graphs, bar graphs etc and Zanran fills that gap. Like a Google for data but it works much better than Google for data. When you put words into Google you simply get lots of pages of varying quality and relevance which you have to work through.
If you run a search in Zanran when the results appear run the cursor down the PDF or Excel icons and an image from the document appears.
You can add limits as well, such as saying that the the site must be less than 2 years old, that the site must come from a certain country or search for specific sites (for example searching *.gov.uk will bring up only material from UK government sites).