Your intestine is the long tube in your digestive system that digests food and absorbs nutrients. You have a small intestine and a large intestine. Your large intestine (colon) connects your small intestine to your rectum (the pouch at the end of your large intestine where stool is stored until you pass it).
Your digestive tract is the path that food takes through your body after you eat it. Food goes from your mouth (eating) to your anus (passing stool). Your intestine is the long tube in your digestive system that connects your stomach to your anus. It digests food and absorbs nutrients.
Your stomach makes a lot of acid, which helps digest food. Normally, the lining of your stomach and intestines has defenses against the acid. If something interferes with those defenses, the acid can cause damage.