Do I have to plug-in a PHEV?

Like all hybrids, they combine an internal-combustion engine with an electric motor and battery, but unlike 'full' hybrids, they need to be plugged in to charge on a regular basis in order to operate as intended. ... PHEVs occupy a middle ground between battery-electric vehicles and full hybrids.What is a plug-in hybrid, or PHEV? | DrivingElectric