The angled S-shape board is slight different than a flat chopping board, it makes cutting tasks a little easier. Food falls away from the knife easily and can be collected in the ridges for pouring into pans or dishes. The raised angle keeps the base clean so it can easily be flipped to deal with different cutting tasks.
Clearly marked sides for food type separation
Unique shape for easier cutting, collection and controlled pouring (ideal for liquid retaining)
(courtesy of Uutensil)