Sausage is made from comminuted and seasoned meat that is either fresh, cured, smoked, or heat processed. It originated as a way to preserve meat and was popularized as soldiers carried it between regions, spreading different styles across Europe. Sausage contains meat, fat, curing agents, flavors, and a casing. There are many types including fresh, cooked, smoked, and dry varieties that are distinguished by their preparation methods and ingredients. Natural and collagen casings are most commonly used but cellulose and plastic options also exist. Proper equipment, cleaning, and technique are required to safely produce sausage at home.