An intelligent system is a system that has its own main objective, as well as senses and actuators to reach its objective. It chooses an action based on its experiences. It can learn by the experiences that has occured to it and stores in its memories. Examples of intelligent systems are: people, higher animals, robots, computers, extraterrestrials, a business, etc.
An example of an intelligent system is the robot that is exploring Mars. It is because it is programed to analyse the ground and air around it by using its metal arms and picks up anything that interests the scientists. It learns to recognise what they need to pick up and what is not is so important.
