Any of various marine cephalopod mollusks of several families of the superorder Decapodiformes (or Decabrachia), having a usually elongated body, eight arms and two tentacles, a reduced or absent internal shell, and a pair of fins.
 The body is cone-shaped and pale with light brown spots. The head is large and there are 10 touching feet in front and triangular fleshy fins at the tail. It often swims in groups in the sea about 20 meters deep.  
Nutritional analysis  
1. Squid is rich in calcium, phosphorus and iron, which is good to bone development and hematopoiesis, and can effectively treat anemia;  
2. Squid in addition to rich protein and amino acids needed by the human body, squid also contains a lot of bezoar acid, can inhibit the cholesterol content in the blood, relieve fatigue, restore vision, improve liver function;  
3. Its polypeptide and selenium have anti-virus and anti-radiation effects;  
4. Professor Wang Cunxin of institute of Oceanology, Chinese Academy of Sciences said cholesterol can be divided into low density and high density, and the cholesterol in squid is mainly high density, which is good for human body.  The structure of fat in squid is obviously different from that of livestock and poultry.  
5. Contains protein, omega-3 fatty acids, copper, zinc, B vitamins and iodine.  B vitamins help relieve migraines, phosphorus helps calcium absorption Note: don't eat more than a fist of squid a day, preferably not fried.  
According to Traditional Chinese medicine, squid has the function of nourishing Yin and stomach, nourishing deficiency and moisturizing skin.