An ileostomy is a surgically made opening on the skin of the belly. An ileostomy replaces the rectum as the place where waste of the digestive system (stool) leaves the body.
Usually the colon (large intestine) absorbs most of the water that you eat and drink. With an ileostomy in place, the colon is no longer being used. This means that the stool from your ileostomy has far more liquid than a typical bowel movement from the rectum.
The stool now comes out from the ileostomy and empties into a pouch that is attached to the skin around your stoma. The pouch is made to fit your body well. You must wear it all the time.
The waste that collects will be liquid or pasty, depending on what you eat, what medicines you take, and other things. Waste collects constantly, so you will need to empty the pouch 5 - 8 times a day.