Walnuts are nutrient-rich edible seeds from the tree Juglans regia, also known as the Persian or English walnut. They have a hard, grooved shell encasing a two-lobed kernel with a distinctive brain-like appearance. Walnuts are prized for their mild, earthy flavor with a slightly bitter-sweet aftertaste, owing to their high oil content, particularly omega-3 fatty acids. They are consumed raw, roasted, or as an ingredient in both sweet and savory dishes. Rich in healthy fats, protein, vitamins, and minerals, walnuts are a popular choice in healthy diets and are cultivated in temperate regions worldwide, with major producers including the USA, China, and India.