Mostly processed cheese, as slices and snacks, and mozzarella for pizza and baked rice; menus often call it 芝士. In Beijing, 奶酪 also names a sweet set-milk pudding made with rice wine.
奶酪 is the standard Mandarin word for cheese. In some regions you may also hear 芝士 (from English 'cheese') or 起司 (from English, used in Taiwan).
culture
In Beijing, 奶酪 also names a traditional dessert: milk set with sweet rice wine into a soft curd and sold in small bowls, often as 宫廷奶酪 (palace milk pudding).