Endoscopy: Endoscopy is a broad term used to described examining the inside of the body using an lighted, flexible instrument called an endoscope. In general, an endoscope is introduced into the body through a natural opening like the mouth or anus. Although endoscopy can include examination of other organs, the most common endoscopic procedures evaluate the esophagus (swallowing tube), stomach, and portions of the intestine.
A rigid endoscope is a thinner, smaller stiff version of an endoscope, used for more specialized visualization.

Flexible Endoscope
G.I. scoping for Gastric ulcers, foreign body ingestion, GI tissue biopsy, and more

Rigid Endoscope
Rhinoscopy, Cystoscopy

Example of a hard copy image of an abnormal liver from adbominal endoscopy: