Sausage is seasoned ground pork that is often enclosed in a casing seasoned with ingredients. The ground pork used for sausage can come from a variety of cuts of pork including the shoulder butt and the loin. Sausage may be fresh, smoked or cured. The difference between mild or spicy-flavored Italian sausage and sweet Italian sausage is that sweet Italian sausage has sweet basil in its spice mix. Sold by the pack.