There are several types of beans that can be used in chili, but the most commonly used ones are pinto, kidney, and black beans. These beans are preferred because they hold up well to the cooking process and complement the other ingredients in chili. Other types of beans, such as cannellini beans and garbanzo beans, can also be used in chili, but they are less commonly used. Ultimately, the choice of beans depends on personal preference, and you can use any type of beans that you like in your chili.