[scarface74]

An untethered jailbreak is one that doesn’t required you to be connected to your computer. (http://osxdaily.com/2010/11/24/tethered-jailbreak-vs-untethe...). A tethered jailbreak requires you to be connected to a computer.

The difference is that an untethered jailbreak takes advantage of a security flaw in the OS that could be theoretically embedded into a website that you visit and your phone could be jail broken without your knowledge.

A tethered jailbreak means that you either intentionally took steps to bypass the security of the OS or someone who had access to your device did.