Endoscopy is a non-surgical medical procedure performed orally to directly visualize the internal structures of the digestive system. This procedure allows a gastroenterology specialist to thoroughly examine organs such as the esophagus, stomach, and duodenum without making any incisions. An endoscope consists of a flexible tube with a camera and a light at its tip, and it is used for the diagnosis and sometimes treatment of conditions in these areas. In necessary cases, specialized instruments can be integrated into the endoscope for additional procedures like taking biopsies.