Qgis Zonal Statistics by CM

Note: The link to the manual description does not work.

What is it?
Calculates statistics on values of a raster within the zones of another dataset. Click HERE! to read manual description. A single output raster is represented in the attribute table for every input zone in the zonal statistical tool.

What does it do?
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Another way to look at it…
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Zonal Statistics enables the following measurements to be taken with between different datasets…

Majority Maximum Mean Range Variety
Median Minimum Minority STD Sum

To better understand QGIS Zonal Statistics, you should look into heatmaps and the importance of zonal statistics in heatmaps:
http://djjr-courses.wikidot.com/soc128:making-heatmaps

Why is it useful?
Good for aerial analysis, such as biologist plotting algae or forest growth