核桃, also known as walnut, is a type of tree nut that is commonly consumed as a snack or used in cooking. It has a hard, brown shell that encases a wrinkled, edible seed. Rich in healthy fats, protein, and various vitamins, walnuts are often praised for their nutritional benefits, including heart health and brain function support. These nuts are native to regions of Central Asia and have been cultivated for thousands of years. In addition to being eaten raw, walnuts can be toasted, ground into flour, or used to make walnut oil. They are a popular ingredient in many dishes, including salads, desserts, and baked goods.