An endoscopic camera is a device that is used to view and record video in inaccessible places. The equipment consists of a long cable and a camera at the end.
The long cable or the flexible tube used in an endoscope must be suitable for its specific use. That is why the flexible tube used in a medical endoscopy is not used for a pipe inspection. Each flexible tube has two or three main optical cables.
These cables can contain up to 50,000 separate optical fibers made of visual quality plastic or glass. One of these cables is responsible for capturing the images through the camera. The other cable is responsible for providing light.
The light is necessary because, inside a human body or a pipe, there is not enough light to obtain images. One of these cables will only transmit the data about the images obtained.
Before anything else, you may read this article
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(1) perform a surgery - https://www.hopkinsmedicine.org/health/treatment-tests-and-therapies/methods-of-surgery
(2) internal parts of a vehicle - https://www.quora.com/What-are-the-internal-and-external-parts-of-the-vehicle