Strops are a necessity when it comes to keeping your straight razor sharp.  Using it after every shave, it keeps the very fine edge true and aligned.  Without stropping the blade gets dull much, much quicker and loses its comfort after only a few shaves.  If you are new to straight razors and want a good strop to learn and practice on, check out the English Bridle Board Strop.  Easier to use than a hanging strop, it is a very good option for those trying out straight razors for the first time.