Well, Velcro is when you stick something together like Velcro shoes. a zipper is the thing on a coat or sweat shirt that zips up.
a zipper is zipped up and down a velcro you can strap
There is a zipper closure.
Zippers
yes
Velcro and buttons
They hook things together by force and they both make noise.
A velcro closure for your pda case is good for attaching the pda on your belt for easy access while a zipper closure good for holding other items in addition to the pda such as a pad of paper and a pen.
velcro in my opinion is easier to use when it comes to closing jackets. it also closes quicker than zippers do. Zippers can get caught, in the fabric of the coat or jacket, but velcro would just stick together easily.
You can buy zipper, or velcro covers for feather beads for extra softness.
The success of the zipper led to the conception and development of many other innovations. Velcro, the plastic zipper, and resealable plastic bags all have origins that link directly back to the hookless fastener.
It can hurt you.
benjamin franklin had the idea when he was thinking about it after he discoverd eletricity he made the zipper but in a different time and color