Jack in the Box is a quick-service hamburger restaurant chain. Jack in the Box restaurants offer a broad selection of distinctive, innovative products targeted at the adult fast-food consumer. The Jack in the Box menu features a variety of hamburgers, specialty sandwiches, salads, Mexican food, finger foods and side items. The core of the Jack in the Box menu is its hamburger products, including its signature hamburgers, the Jumbo Jack, Ultimate Cheeseburger and Sourdough Jack.