Learning is one of the most important mental functions in humans, animals and artificial systems. Learning is a very broad term that has different meanings in different contexts. The term learning can be used to describe the results of learning (Illeris, 2007).
The clearest examples of learning can be found by observing children. Human beings spend their early days in learning new abilities, skills, and behaviors. However, the learning process does not end with childhood. Human beings continue to learn as they grow and age (Garvin, 2000).