Quoting from wiki source :
Sankey diagrams are a specific type of flow diagram, in which the width of the arrows is shown proportionally to the flow quantity.
Sankey diagrams put a visual emphasis on the major transfers or flows within a system. They are helpful in locating dominant contributions to an overall flow. Often, Sankey diagrams show conserved quantities within defined system boundaries.
This is a d3.js sankey diagram about Indonesian Government Budgeting Plan in general for year 2012 to 2014. Hover your cursor on it to see various details.
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My original, fullwidth view of this diagram can be found by clicking the button below.