1. Internal Combustion Engines (IC Engines):

   • Gasoline Engines (Petrol Engines): These engines use gasoline as fuel and are commonly found in cars and motorcycles.
   • Diesel Engines: Diesel engines use diesel fuel and are often found in larger vehicles like trucks, buses, and some cars.

2. External Combustion Engines:

   • Steam Engines: These engines use external combustion to produce steam, which then drives a piston or turbine. While they were widely used in the past, modern applications are limited.

3. Electric Motors:

   • Electric engines: Electric vehicles (EVs) and hybrid vehicles use electric motors powered by batteries. They are becoming increasingly popular for their environmental benefits.

4. Jet Engines:

   • Turbojet Engines: Commonly used in aircraft, these engines take in air, compress it, mix it with fuel, and then ignite it to produce a high-speed exhaust jet that propels the aircraft.
   • Turbofan Engines: These are a type of air-breathing jet engine, commonly used in commercial aircraft. They combine elements of both turbojet and turboprop engines for better fuel efficiency.

5. Rocket Engines:

   • Liquid Rocket Engines: Used in spacecraft, these engines use liquid propellants, such as liquid oxygen and liquid hydrogen, which are mixed and ignited to produce thrust.
   • Solid Rocket Engines: These engines use solid propellant and are often used in military applications, space exploration, and fireworks.

6. Wankel Engines:

   • Also known as a rotary engine, the Wankel engine is characterized by its rotary motion. It uses a rotor instead of pistons and is known for its compact design.

7. Turboprop Engines:

   • These engines combine a gas turbine engine with a propeller. They are commonly used in smaller aircraft and some military planes.

8. Stirling Engines:

   • Stirling engines operate on the principle of a fixed quantity of gas, typically air, that is cyclically heated and cooled to drive a piston. They are known for their high efficiency.

These are just a few examples, and there are many variations within each type of engine. The choice of engine depends on factors such as application, efficiency requirements, fuel availability, and environmental considerations.