1 - In a physical keyboard touch the keys pressionamcnto you slide a capsule of foam rubber.
2 - The capsule press a blade of plastic, located at its lower end, which in turn has an area
Metal connected to the rest of the printed circuit board of the keyboard.
The metal surface comes into contact with a
similar surface on another plastic sheet, allowing current to pass through the printed circuit connected
each of the cushions.
3 - When the key is released, the capsule back to its original shape, releasing pressure on the plastic blade.
The plastic
also returns to its original position, breaking the circuit and cutting the chain.
Source: Evolution of Computers
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