A multitude of sensors picks up information and delivers it to the control unit, the brain of the system, where the signals are evaluated and decisions are made which are necessary for the optimal operating of the system.
To put it simply.
The brain controls all functions and actions of the human body.
The Comparison of a Ball Game:
In a football match, the goalkeeper must constantly survey the situation. He receives information via his eyes. That information is processed in the brain and the position he takes up is selected accordingly. Then comes the shot! The eyes perceive both the path and the speed of the ball. "I’ll catch it!". The brain sees to it that the necessary course of action is followed. And the ball is cleared.
If the speed and the path of the ball are assessed incorrectly or the ball is deflected, then the keeper cannot take up an optimal position. The ball gets into the goal.
This simple example taken from the world of sport describes the way in which an electronic system functions.
