Gaining arbitrary code execution. Modern game consoles (but lots of other devices, including Apple's iOS, which used to have one of the most restrictive enviro

Gaining arbitrary code execution. Modern game consoles (but lots of other devices, including Apple's iOS, which used to have one of the most restrictive environments to develop applications on - it's slightly better these day - as well) restrict the sort of code you're allowed to run on it to only what the manufacturer allows you to run. "Jailbreaking" in this context means that you can bypass those sorts of restrictions, with the implementation of what that entails differing per device. The alternate term you often hear used for this sort of hacking (and slightly older since it predates the iphone) is Homebrew.