What does the organ appendix do?

The appendix is a small, finger-shaped organ attached to the large intestine. It is located in the lower right abdomen. The appendix has no known function in humans, but it is thought to be a vestigial organ, meaning that it was once useful but is no longer necessary for survival. In some cases, the appendix can become inflamed, resulting in appendicitis, a condition that requires surgical removal of the appendix.