Hello bala,

Mechatronics:- Field of study integrating mechanical and electronics principles onto a single device. The term came up after mid-20th century referring to systems that had already integrated both the branches quite effectively.

 This also exemplifies that an excellent mechanical component with poor electronics will ultimately result in a poor system. Both need to be studied, tested, and implemented with high importance.

 Examples include escalators, elevators, anti-lock systems, refrigerators, robots etc. Imagine one of these devices with amazing electronic circuits, but lacking in mechanical stability, materials choice, or temperature tolerance.

Robotics:- 

 Field of study integrating computer science, electrical and mechanical engineering primarily. It is a more specialized field of mechatronics engineering.

 Robota (Czech word) meaning forced labor translated to the English word Robot in 1923 by author Karel Capek.

Examples include robotic arms, unmanned vehicles (drones, self-driving cars), humanoids etc.

All robotic systems are mechatronic systems but all mechatronic systems are not robotic systems.