iOS jailbreak, jailbreak or just the process of removing the restrictions imposed by Apple on devices with IOS operating system using custom kernels. Such devices include the iPhone, iPod touch, iPhone and second generation of Apple. Jailbreaking allows users to gain root access to the operating system, so users of IOS additional applications, extensions and themes that are not available through the official store of Apple applications for download. Jailbreaking is a privilege escalation, and the term applies to an escalation of privileges to the computer systems of others. The name refers to the breakdown of the device of "prison" , a technical term used in Unix-like systems such as FreeBSD jail. A jailbroken iPhone, iPod touch or iPhone with IOS can still use the App Store, iTunes and other normal functions, such as making phone calls.
Unlike the rooting an Android device, jailbreak is required if the user intends to run unauthorized software by Apple. A tethered jailbreak requires that the device is connected to a computer whenever it needs to be restarted, a jailbreak unbound device can be operated without the help of computer. Under the Digital Millennium Copyright Act, iPhone jailbreaking is legal in the United States, although Apple has announced that the practice "may violate the warranty."
One of the main reasons for jailbreaking is to extend the feature set is limited by Apple and the App Store. Most tools automatically install jailbreak Cydia, an APT IOS Native Client can be used to find and install software to jailbreak IOS devices.  Since the software available through Cydia are not required to adhere to the guidelines App Store, many of them are not usually self-those applications, but are extensions and adaptations to IOS and other applications.  users to install these programs for purposes including personalization and customization of the interface , adding features and fixing unwanted discomfort,  and make development easier on the device to provide access to the file system and command line tools.  
Some users of software to look outside the App Store to oppose the censorship of content through the approval process for Apple applications to express, in the beginning of 2010, Apple banned an application by the Pulitzer Prize-winning cartoonist Mark Fiore, because it is "ridiculous public figures" in violation of Section 3.3.14 of the iPhone Developer License Agreement Program. Apple later called Fiore and asked for his application again for approval.  In late 2010, Apple banned the use of applications that allow users to donate money to nonprofit organizations and charities.  to Apple for applications banned WikiLeaks, saying it "violated their patterns of development."  As the list of prohibited applications is growing, some users have found a viable alternative to jailbreaking the Apple censoring content.