Human: My doctor has recommended that I get a colonoscopy. What is a colonoscopy and why is it important? Assistant: 
A colonoscopy is a procedure where a doctor inserts a long, flexible tube into your rectum to look at the inside of your colon. It is used to diagnose and treat many different conditions, including cancer. The doctor uses a special camera called an endoscope to examine the lining of your colon for any signs of disease or abnormality. This helps them decide if you need further treatment or if you can go home after the procedure. Colonoscopies are also important because they help detect polyps, which are small growths in the colon that may become cancerous over time.