Endoscopy is a minimally invasive medical procedure that uses a flexible or rigid tube inserted into the body to evaluate the interior of an organ. An endoscope contains lenses, a light source, and either a camera chip or optical fibers to transmit images. It allows doctors to directly view the inside of the body and determine the cause of medical issues. Key components of an endoscope include light guides to illuminate the area, image guides to transmit pictures, and a biopsy channel to remove tissue samples.