A corncob is the central core of a maize (Zea mays ssp. mays L.) ear. It is the part of the ear on which the kernels grow. The corn plant's ear is also considered a "cob" or "pole" but it is not fully a "pole" until the ear is shucked, or removed from the plant material around the ear.
Young ears, also called baby corn, can be consumed raw, but as the plant matures the cob becomes tougher until only the kernels are edible.
When harvesting corn the corncob may be collected as part of the ear or may be left as part of the corn stover in the field.
The innermost part of the cob is white and has a consistency similar to foam plastic.
Read more about Corncob: Uses