Colon Cancer is the cancer of the colon, which is a part of the large bowel or large intestine. Intestines along with a group of organs collectively constitute the digestive system, this system helps us to eat and use the food to produce fuel and energy to run our bodies. Large intestine is divided in 2 parts Colon and Rectum. Colorectal cancer is a term used to define the cancer of the colon or rectum. The cancer starts as a benign clump of cells called polyps inside the colon, some of these polyps can become cancerous.