かつお節 is a traditional Japanese food made from dried, fermented, and smoked skipjack tuna, known as かつお. It is typically shaved into thin flakes and used as a key ingredient in many Japanese dishes, adding a rich umami flavor. This ingredient is often used to make だし, a flavorful broth that serves as a base for soups and sauces. In addition to its culinary uses, かつお節 is also a popular topping for rice and salads, enhancing the taste and aroma of various meals.