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Theory:

A rocket is a spacecraft or a space vehicle with a highly powerful engine intended to transport people or equipment beyond earth's atmosphere and out into space.
shutterstock_777258577.jpg
A rocket
Parts of rocket:
There are four main systems or components in a rocket. They are
  1. Structural system
  2. Payload system
  3. Guidance system
  4. Propulsion system
rocket parts.png
Structure of rocket
 
1. Structural system:
The structural system is the frame that acts as a cover and protects the rocket from the outer elements. It is made of materials that are both very powerful and lightweight solid, such as titanium or aluminium. Metallic fins-like structures are connected to some rockets at the bottom of the frame to maintain stability during flight.
 
structure ksc-2014-3075-30f8ee-1024.jpg
Rocket's structure
 
2. Payload system:
The payload is the object transported into orbit by the satellite. The mission of the rocket determines the payload. The rockets have been adapted to launch satellites for various missions, including communications, weather forecasting, spying, planetary exploration, and observatories. Special rockets are now being designed to send people into earth's orbit and onto the moon's surface.
 
payload ksc-2011-6056-be13c0-1024.jpg
Payload
 
3. Guidance system:
The guidance system includes sensors, onboard computers, radars, and communication equipment. This system guides the course of the rocket.
 
Minuteman_III_guidance_system_-_Smithsonian_Air_and_Space_Museum_-_2012-05-15_(7275763010).jpg
Guidance system
 
4. Propulsion system:
The propulsion system takes up the majority of a rocket's volume. Fuel or propellant tanks, pumps, and a combustion chamber make up the propulsion system. Propulsion systems are divided into two categories, namely, liquid propulsion system and solid propulsion system.
 
the-first-stage-s-1-c-of-apollo-6-as-502-is-erected-at-the-vehicle-assembly-37757a-1600.jpg
Propulsion system
 
Important!
India's famous rockets are Polar Satellite Launch Vehicle (PSLV) and Geosynchronous Satellite Launch Vehicle (GSLV).
Reference:
https://cdn2.picryl.com/photo/2014/06/30/ksc-2014-3075-30f8ee-1024.jpg
https://cdn2.picryl.com/photo/2011/07/27/ksc-2011-6056-be13c0-1024.jpg
https://upload.wikimedia.org/wikipedia/commons/8/8c/Minuteman_III_guidance_system_-_Smithsonian_Air_and_Space_Museum_-_2012-05-15_%287275763010%29.jpg
https://cdn10.picryl.com/photo/1968/03/06/the-first-stage-s-1-c-of-apollo-6-as-502-is-erected-at-the-vehicle-assembly-37757a-1600.jpg
https://www.grc.nasa.gov/www/k-12/rocket/rockpart.html