This category accepts sites that deal with jailbreaking iOS. Applications, news, forums, help, and tutorial sites are listed here. We do not list or condone sites that break the law and you should check the provisions where you are located to find out if jailbreaking is allowed in your location. A good place to start your research to see how jailbreak laws apply to you is http://en.wikipedia.org/wiki/IOS_jailbreaking
iOS jailbreaking is the process of removing limitations on iOS, Apple's operating system on devices running it through the use of software and hardware exploits; such devices include the iPhone, iPod touch, iPad, and second-generation Apple TV. Jailbreaking permits root access to the iOS file system and manager, allowing the download of additional applications, extensions, and themes that are unavailable through the official Apple App Store.
Jailbreaking is a form of privilege escalation, and the term has been used to describe privilege escalation on devices by other manufacturers as well. The name refers to breaking the device out of its "jail",which is a technical term used in Unix-style systems, for example in the term "FreeBSD jail". A jailbroken iPhone, iPod touch, or iPad running iOS can still use the App Store, iTunes, and other normal functions, such as making telephone calls.
Restoring a device with iTunes removes the jailbreak.
Unlike rooting an Android device, jailbreaking is necessary if the user intends to run software not authorized by Apple. The legality of jailbreaking depends on countries and conditions.
From Wikipedia.org http://en.wikipedia.org/wiki/IOS_jailbreaking