fopen() vs. open()

From: Grocery Clerk (cdalten_at_yahoo.com)
Date: 09/30/04 

Date: 29 Sep 2004 21:33:57 -0700

I know open() returns a file descriptor and fopen() returns a pointer
to FILE. The question is, when do I use fopen() and when do I use
open()? Could someone give me an example when to use one over the
other?