Jailbreaking is a process that allows iPad, iPhone and iPod Touch users to install homebrew applications on their devices by unlocking the operating system and allowing the user root access. Once jailbroken, iPhone users are able to download many extensions and themes previously unavailable through the App Store via unofficial installers such as Cydia.
A jailbroken iPad, iPhone or iPod Touch is still able to use the App Store and iTunes. Jailbreaking is different from SIM unlocking, which, once completed, means that the mobile phone will accept any SIM without restriction on, for example, the country or network operator of origin.
The Daily Omnivore 
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