
Apple checks apps for compliance with its iOS Developer Program License Agreement before accepting them for distribution in the App Store. One of the reasons for jailbreaking is to expand the feature set limited by Apple and its App Store.

Apple views jailbreaking as a violation of the end-user license agreement, and strongly cautions device owners not to try to achieve root access through the exploitation of vulnerabilities. Different devices and versions are exploited with a variety of tools.
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A jailbroken device permits root access within the operating system and provides the right to install software not available through the App Store. Typically it is done through a series of kernel patches. On Apple devices running iOS and iOS-based operating systems, jailbreaking is the use of a privilege escalation exploit to remove software restrictions imposed by the manufacturer.

Removal of limitations from Apple's iOS devices
