Endoscopy is a medical procedure in which a flexible tube with a light and camera at its tip (endoscope) is inserted into the body to look at and examine the internal organs or structures.
For example, during an endoscopy, the doctor may insert the endoscope through the mouth to examine the esophagus, stomach, and upper part of the small intestine.
Very Simple Definition:
Endoscopy is a medical procedure where a doctor uses a long, thin tube with a light and camera to look inside the body.
For example, the doctor may use a special tube with a light to look inside the stomach and intestines.