A MOSFET is a type of transistor we can use as a digital switch.
The name stands for Metal Oxide Silicon Field Effect Transistor.
The first MOSFET was made in 1959 by Mohamed M. Atalla & Dawon Kahng.
- Easy to manufacture in volume
- Easy to change its size
- It is the basic building block of modern electronics
They are the most manufactured object worldwide: 1.3×10^22 of them have been made between 1960 and 2018 - Wikipedia
Image is from components101
You can see the gate and body connections as the 2 sides of a capacitor.
When an electric field is applied by charging the gate, the electro-chemistry of the
channel region will change and allow current to flow between the source and the drain.