The operation normally involves removing the lower part of the large bowel, The upper part is brought out through the abdomen wall normally on the right hand side to the surface this is called a Colostomy.
The output from the remaining colon is then collected in a colostomy bag which is attached to the outside of the abdomen wall. The other end of the bowel toward the rectum/back passage is then closed with stitches and left inside the abdomen.
Depending on the reason for your operation this may be temporary to allow the bowel to rest and heal or permanent in certain cases.
You’re Stoma Nurse or Consultant will discuss this with you in more detail.