A colostomy bag is a medical device used to collect waste from the body after a colostomy surgery, where the colon is diverted through an opening in the abdomen known as a stoma. The bag is attached to the stoma, allowing feces to be collected directly into the bag instead of passing through the rectum. It is typically made from flexible, waterproof materials and designed to be comfortable and discreet under clothing. Colostomy bags are used by individuals who have undergone surgery due to conditions like colon cancer, severe inflammatory bowel disease, or injury to the digestive tract.