Graham crackers are a type of sweet, crisp cookie made from graham flour, which is a whole wheat flour. They were invented in the early 19th century by a Presbyterian minister named Sylvester Graham, who believed in a healthy diet. These crackers are often used in desserts, such as s'mores, and can be enjoyed on their own or with toppings like peanut butter or marshmallow. Typically rectangular in shape, graham crackers have a slightly sweet flavor and a crunchy texture. They are commonly found in grocery stores and are popular for their versatility in recipes, including crusts for pies and cheesecakes.