Pork belly (also known as rib meat and three-layer meat) is located in the abdomen of pigs. There are many adipose tissues in the abdomen of pigs, including muscle tissues, which are fat and thin, so it is called "pork belly".

In fact, it is the external ribs and abdominal muscles of pigs, which contain more fat and are mixed in multiple layers of muscles, so the fat and muscles are arranged alternately after cutting, hence the name. Specifically, the pork belly contains three layers of muscles (transverse abdominis, oblique abdominis and oblique abdominis), with skin on the outside, and two layers of fat and five layers of * * * between the three layers of muscles, hence the name.