"Engine" is used to describe an assembly of parts that contain a motor and the systems to make the motor more efficient and self-sustaining.

"Motor" is used to describe a device that converts energy into motion

Bringing up details from my comment below, the motor component of a traditional car engine is the piston/crank/cylinder assembly; as this is the part that converts fuel into motion. The rest of the engine is a necessary part to keeping the motor running.

However, when it comes to cars, people tend to use the terms interchangeably. If you have a hybrid car, your engine will have two types of motors (combustion motor and electric motor).

"Engine" and "motor" are almost the same thing, and when talking about cars are often used interchangeably. However, an engine usually refers to an internal combustion engine (which is gasoline or diesel-powered), while a motor usually refers to an electric motor, as used in electric cars.

Most cars only have an internal combustion engine. People just refer to it interchangably as an engine and a motor.

There's a small number of cars that have both an internal combustion engine and an electric motor, called hybrids. They try to take advantage of the best of both worlds, giving the range of the ICE and the fuel economy of the electric motor.

Some cars don't have an engine and only have an electric motor inside.

Most people use the terms interchangeably and probably nobody would ever call you on it. In strict definition they are not the same thing. Hybrids have a motor and an engine, so do F1 racing cars.

I think you have some confusion with terms. Generally, where I am from motor is another term for an engine(usually an older term not used as much anymore, or as slang), unless you're more specifically talking about an electric motor.

Internal combustion engines (conventional cars) have an engine that uses gas or diesel to cause controlled explosions that turn chemical energy into rotational mechanical energy. They only have one engine or "motor" which transmits power to the transmission, then eventually to the wheels.

Electric cars have battery packs that power 1-4 electric motors which in turn move the wheels (depends on the variety of electric car).

You can also have hybrids which is perhaps what you are asking about? Where it's a combination of a convential gas or diesel engine that can either power the car directly, or can charge the larger battery packs that can power electric motors. This is more akin to an generator, that burns fuel to produce power, being connected to an electric motor(s) to move the tires. The car can run on battery power, engine power, or a mixture depending on the situation.

These are generalizations, if you provide more specifics about your question I would be happy to clarify anything.

All these comments are correct but also missing the fact that gas-powered engines do also have a separare starter motor, which is powered by the car battery, whose purpose is to start the gas engine's crankshaft rotating so it can start burning gasoline and sustain ignition on its own. It is only used for a few seconds, unlike a hybrid car's electric motor which is used continuously while driving.

All these comments are correct but also missing the fact that gas-powered engines do also have a separate starter motor, which is powered by the car battery, whose purpose is to start the gas engine's crankshaft rotating so it can start burning gasoline and sustain ignition on its own. It is only used for a few seconds, unlike a hybrid car's electric motor which is used continuously while driving.