The main difference between a Hybrid (HEV) and a Plug-in Hybrid (PHEV) is how the battery is charged and the electric-only driving range.
A Hybrid Vehicle (HEV) charges its battery through the petrol engine and regenerative braking, that assists the petrol engine for better fuel efficiency, but it cannot drive the car on electricity alone for long distances.
A Plug-in Hybrid Vehicle (PHEV) has a larger battery that can be charged via an external power source (like a home charging station). These cars and SUVs and can run on electric power alone for a much longer distance than a traditional hybrid.
Mazda’s PHEVs, like the CX-60 Skyactiv or the CX-80 Skyactiv, combine a petrol engine with a larger electric motor and high-capacity battery, to offer up to 76km of electric-only driving range in some models.