Introduction
MEMS stands for Micro Electromechanical Systems. It refers to the integration of mechanical elements, sensors, actuators, and electronics on a common silicon substrate through microfabrication technology. MEMS devices are typically small in size and have the ability to sense, control, and actuate on the microscale.

Explanation
The correct answer is option B, Micro Electromechanical System. Here is a detailed explanation:

Microscale Integration
- MEMS technology allows for the integration of various components on a microscopic scale.
- Mechanical elements such as microsensors and microactuators are combined with electronics on a single chip.
- This integration enables the development of compact and efficient devices.

Electromechanical Systems
- MEMS devices are electromechanical systems because they involve the interaction between electrical and mechanical components.
- The sensors in MEMS devices convert physical stimuli, such as pressure or temperature, into electrical signals.
- The actuators, on the other hand, use electrical signals to generate mechanical motion or force.

Applications
- MEMS technology has a wide range of applications in various fields.
- In consumer electronics, MEMS accelerometers and gyroscopes are used for motion sensing in smartphones and gaming consoles.
- In the automotive industry, MEMS pressure sensors are used for airbag deployment and tire pressure monitoring.
- MEMS microphones are used in hearing aids, smartphones, and other audio devices.
- MEMS devices also find applications in healthcare, aerospace, robotics, and many other industries.

Advantages
- MEMS devices offer several advantages due to their small size and integration capabilities.
- They are lightweight, compact, and consume less power.
- MEMS sensors and actuators can be mass-produced using batch fabrication techniques, making them cost-effective.
- MEMS technology enables the development of highly sensitive and accurate sensors.

Conclusion
In conclusion, MEMS stands for Micro Electromechanical Systems. It represents the integration of mechanical elements, sensors, actuators, and electronics on a common silicon substrate. MEMS devices have diverse applications and offer several advantages in terms of size, cost, and performance.