The feature of iOS 5 works with iPad, iPhone or iPod touch as a wirelessly device with internet issues. To get iOS 5, the first order of business is to update to iTunes 10.5. Open iTunes and then click iTunes > Check for Updates to install version 10.5. Read more from howto.cnet.com/8301-11310_39-20119358-285/how-to-install-ios-5/.
iOS on Apple devices is the operating system, and iOS 5.0 is the latest update. Just plug your iPad into a computer with iTunes, open it up, and it will prompt you to update. Once the update is complete you will receive new features exclusive to iOS 5.0. Hope this helped! :)