Tableau Public is an application that can help anyone transform small or large data sets into relevant graphs and charts that can then be shared with others and published online. As the word 'public' suggests, the created workbooks can't be locally saved, rather it is sent to Tableau's public cloud which can be accessed by the general public.
This is essentially a free version of Tableau visualization software. It allows you to use the majority of the software functions.You can create visualizations and connect to CSVs, Text and Excel documents. However, the largest difference is that Tableau Public does not allow you to save your workbooks locally.
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