Prosciutto is an Italian dry-cured ham that is usually thinly sliced and served uncooked; this style is called prosciutto crudo in Italian (or simply crudo) and is distinguished from cooked ham, prosciutto cotto. Prosciutto is made from either a pig's or a wild boar's hind leg or thigh, and the base term prosciutto specifically refers to this product. 
The ham is first cleaned, salted, and left for about two months. During this time, the ham is pressed, gradually and carefully so as to avoid breaking the bone, to drain all blood left in the meat. Next, it is washed several times to remove the salt, and is hung in a dark, well-ventilated environment. The surrounding air is important to the final quality of the ham; the best results are obtained in a cold climate. The ham is then left until dry. The time this takes varies, depending on the local climate and size of the ham. When the ham is completely dry, it is hung to air, either at room temperature or in a controlled environment, for up to 18 months.