Area Charts are usually used when you need to show changes in amount of something depends on time or another changing value (which can be demonstrated on the X-Axis). A 3D Area Chart differs from the 2D Area only by its appearance, as its series become volumetric.
This Chart has two 3D Area series that demonstrate how the ACME Corp. and its competitor’s share average prices in dollars were changing from 1986 till 2005. The Y-Axis holds values in dollars from 0 to 240, and the years are distributed along the X-Axis. The tooltip on this chart is set in union mode, so you can see the values of both companies’ share prices on the same tooltip. The legend is disabled, as it is not necessary to disable any of the series for a better look of another one.