Hybrid vehicles explained:

Hybrid vehicles have both an internal combustion engine and an electric motor. 

The electric motor in a hybrid vehicle assists the engine and is primarily used to improve fuel efficiency.

Plug-in hybrid vehicles explained:

Plug-in hybrid vehicles have both an internal combustion engine and an electric motor. However, they have a larger battery pack compared to regular hybrid vehicles.

These cars can operate in electric-only mode for a significant distance, using electricity stored in their batteries.

Electric vehicles explained:

Electric vehicles are entirely powered by electricity. They do not have an internal combustion engine and rely solely on electric motors for propulsion.

These cars must be plugged into an electrical outlet or charging station to charge their batteries.