What is it called when doctors stick a tiny camera up your butt?

Thats called a prostate exam, When you are 40 or over it is recomended you take this test because Can cause problems like a cancer or tumor if not treated can cause death The Prostate (or how you called it your Butt) is a gland surrounding the neck of the bladder in the male mammals and realeasing a fluid component of semen to check it if it is healthy they stick a camera up your butt