Or 'PHEV' is a vehicle that has a battery and a combustion engine. The battery can be recharged by plugging it into to an electric socket and is not charged by the combustion engine. PHEVs can be a good compromise if you regularly drive long distances and regularly charge the batteries because they can do short trips e.g. in the city, on electric, reducing tailpipe pollution.
A PHEV that is not recharged is just a combustion car with a heavy battery weight to carry around, so charge them up!
https://www.agnewcars.com/pages/electric/types-of-electric-vehicles/