untethered vs tethered?

A tethered jailbreak means that in order to utilize a jailbreak, your phone must be plugged into your computer each and every time you reboot or power down/power on. Tethered jailbreaks usually come first so if you are really in need of a hacked iPhone this might be the way to go for you, but long term, untethered solutions are more practical. Untethered of course means that you can reboot your phone at any time, with out access to a computer and still be able to enter a jailbroken state.