How many times have you heard the foreskin called "just a flap of skin"? Perhaps when you asked your parents about why circumcision is done, they used this phrase to describe the prepuce. In American culture many people have been indoctrinated to consider it a worthless extra piece of dermis.
However new research has brought a better understanding of the foreskin and its functions. Yes, it has functions.
I hope you find this page informative and enlightening:-)