Squid are important in many different ways. Scientists study cephalopods, because they are smart and have complex brains, in order to learn more about behavior in all species. Squid are very popular in the commercial market because they are eaten as a food in most cultures, and are fished and sold fresh and canned to eat. Squid are also very useful for using as bait, and are commercially fished for bait.

http://en.wikipedia.org/wiki/Fried_calamari