What are the granton edges on some knife blades for?

Some knives have small indentations (granton edges) on their blades that create a layer of air between the food being cut and the knife, making it easier for the food to release and preventing it from sticking to the blade.

Detail of the bolster and granton edges of a santoku knife

Take a look at our granton edge ham slicing knives, or the granton edge santoku knives, for example.