The main difference is how each vehicle is powered. A Hybrid vehicle will switch between a blend of electric energy and a blend of petrol and electric power. An electric vehichle will run on battery power alone.
An EV uses an electric motor powered by a battery - They have a battery rather than a fuel tank. An electric vehicle will require recharging either via a home or a public charging point.
A Hybrid car is one that combines a petrol or diesel engine with an electric motor. Meaning, it should consume less fuel and emit less CO2 than a petrol or diesel engined vehicle. This type of Hybrid would need re-fuelling in the same way as a regular petrol/diesel vehicle. Regular Hybrids can run on electric power alone at low speeds before the petrol or diesel engine takes over.
This type of vehicle is very similar to a regular Hybrid in the sense that they use a petrol/diesel engine combined with an electric motor. The difference between the two is a Plug-In Hybrid (PHEV) has a larger battery and can run on electric power solely for a lot longer and at higher speeds. In order to drive emissions-free, your PHEV would require charging via a home a or public charging point.