Cheese is made from the milk of various mammals through curdling, draining, shaping, salting, and aging. There are hundreds of types of cheese produced worldwide using different processes. The main factors that determine the type of cheese are the length of aging, texture, fat content, milk used, and production methods. Worldwide cheese production totals over 18 million metric tons annually, with the top producers being the United States, Germany, France, Italy, and the Netherlands.