The peanut hull is indeed the outer shell of the peanut that serves to protect the kernel inside. This protective covering is crucial for the peanut's development because it helps shield the kernel from environmental factors, pests, and diseases during its growth and maturation. The hulls are usually discarded during processing, as they are not edible and do not contribute to the consumption of peanuts as a snack or ingredient.
The distinction of the peanut hull primarily lies in its function as a protective shell rather than any edible or internal components, which clarifies why this answer is accurate. Understanding the structure of peanuts, including the hull, is important for those involved in peanut farming, processing, and inspection, as it impacts everything from harvesting to quality assessments.