RATIONAL Aktiengesellschaft engages in the development, production, and sale of professional cooking appliances for industrial kitchens worldwide. The company offers iCombi Pro and iCombi Classic, a combi-steamer with intelligent cooking paths, as well as care products for combi-steamers; iVario, a multifunctional cooking system that cooks in liquids or with contact heat; and ConnectedCooking, an online portal for the professional kitchen. It also provides accessories, service parts, and services for its products.

The company serves restaurants and hotels; communal catering, such as company canteens, hospitals, schools, universities, military, prisons, and retirement homes; and quick service restaurants, caterers, supermarkets, bakery and snack shops, butchers, petrol stations, and delivery services. It sells its products through independent distribution partners. The company was founded in 1973 and is headquartered in Landsberg am Lech, Germany.