This type of EV charger comes with its own charging cable that can’t be unplugged and taken away. When charging your vehicle using a tethered charger, you don’t have to remove your charging wire and insert it into the charger, adding to it’s convenience.
The disadvantages of tethered cables are that they come in fixed lengths ranging from 4.5mtrs to up to 8mtrs depending on the brand of charger, so they may not reach your vehicle in some cases.