Dread Wrapping?

So, I'm not sure if this question has already been answered. But what is the point in wrapping your dreads? I really like the way they look when wrapped in hemp yarn and stuff. I'm just not really sure what purpose it serves... How does is help your dreads? Or does it not help?
updated by @gaby-obregon: 01/13/15 09:56:57PM

it helps and hurts but should be mostly done for decoration only

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My new book Ban The Taboo Vol 1

Mainly decoration, some people like 2 even out bumps and lumps in dreads to help them matture, or ifa dread dos'nt matt well. I just love dread wraps and jewelery so much especially of the natural types

updated by @sweet: 02/05/15 10:12:49AM

I really like how they look. My dreads are only a month old so I don't want to wrap them if it's going to slow down the process or hurt them in any way... Thank you for the help. You guys are the best <3