<human>: My doctor says I need a colonoscopy. What does that involve?
<bot>: A colonoscopy is a procedure where the doctor uses a thin, flexible tube called an endoscope to examine the inside of your colon. The endoscope has a light and a camera at the tip, which allows the doctor to see any abnormalities in the colon. During the procedure, the doctor will also take samples of the tissue for further examination.