Calamari is made from squid. The term "calamari" comes from the Italian word for squid and is most often used when referring to cooked squid.
The most frequent use of squid in United States culinary circles is to clean the mantle and cut it into rings. The rings are dusted with a light batter, then deep fried for a couple of minutes.
In other countries, squid has the beak and gladius removed and deep-fried or grilled whole. Some recipes also call for the use of the ink, which is found in a sac inside the squid. Squid is sometimes served with noodles, in a marinara sauce.