Plug-in Hybrid Electric Vehicles (PHEVs) are cars that combine a traditional gasoline engine with an electric motor. They can be charged using an external power source, allowing them to run on electricity for shorter trips and switch to gasoline for longer journeys. This dual system helps reduce fuel consumption and emissions. PHEVs typically have a larger battery than standard hybrid vehicles, enabling them to travel significant distances on electric power alone. They offer the flexibility of using both electricity and gasoline, making them a popular choice for environmentally conscious drivers who still need the convenience of a conventional engine.